diff --git a/.github/dependabot.yml b/.github/dependabot.yml
new file mode 100644
index 0000000..053c81f
--- /dev/null
+++ b/.github/dependabot.yml
@@ -0,0 +1,7 @@
+version: 2
+
+updates:
+  - package-ecosystem: "pip"
+    directory: "/"
+    schedule:
+      interval: "weekly"
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 28f8440..4477334 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -2,27 +2,54 @@ name: CI
 
 on:
   push:
-    tags: ["v*"]
+    branches: [main]
+  pull_request:
+    branches: [main]
 
 jobs:
-  publish:
-    name: Publish
+  main:
+    name: Test and release
     runs-on: ubuntu-latest
 
     steps:
       - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
       - name: Set up Python 3.9
         uses: actions/setup-python@v2
         with:
           python-version: 3.9
+      - name: Setup poetry cache
+        id: cached-poetry
+        uses: actions/cache@v2
+        with:
+          path: ~/.local
+          key: poetry-${{ runner.os }}
+      - name: Install poetry
+        if: steps.cached-poetry.outputs.cache-hit != 'true'
+        uses: snok/install-poetry@v1
+        with:
+          virtualenvs-in-project: true
+      - name: Setup venv cache
+        id: cached-venv
+        uses: actions/cache@v2
+        with:
+          path: .venv
+          key: venv-${{ runner.os }}-${{ hashFiles('**/poetry.lock') }}
       - name: Install dependencies
-        run: |
-          python -m pip install --upgrade pip
-          pip install setuptools wheel twine
-      - name: Build and publish
+        if: steps.cached-venv.outputs.cache-hit != 'true'
+        run: poetry install
+      - name: Check formatting
+        run: poetry run black --check pynbs
+      - name: Release
+        if: |
+          github.repository == 'OpenNBS/pynbs'
+          && github.event_name == 'push'
+          && github.ref == 'refs/heads/main'
         env:
-          TWINE_USERNAME: __token__
-          TWINE_PASSWORD: ${{ secrets.PYPI_TOKEN }}
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          PYPI_TOKEN: ${{ secrets.PYPI_TOKEN }}
         run: |
-          python setup.py sdist bdist_wheel
-          twine upload dist/*
+          git config --global user.name "github-actions"
+          git config --global user.email "action@github.com"
+          poetry run semantic-release publish -v DEBUG -D commit_author="github-actions <action@github.com>" --prerelease
diff --git a/.vscode/extensions.json b/.vscode/extensions.json
new file mode 100644
index 0000000..8affbb2
--- /dev/null
+++ b/.vscode/extensions.json
@@ -0,0 +1,7 @@
+{
+  "recommendations": [
+    "ms-python.python",
+    "ms-python.vscode-pylance",
+    "bungcip.better-toml"
+  ]
+}
diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000..a026178
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,22 @@
+{
+  "python.formatting.provider": "black",
+  "python.languageServer": "Pylance",
+  "python.linting.enabled": false,
+  "python.linting.pylintEnabled": false,
+  "python.linting.banditEnabled": false,
+  "python.linting.flake8Enabled": false,
+  "python.linting.mypyEnabled": false,
+  "python.linting.prospectorEnabled": false,
+  "python.linting.pycodestyleEnabled": false,
+  "python.linting.pydocstyleEnabled": false,
+  "python.linting.pylamaEnabled": false,
+  "[python]": {
+    "editor.tabSize": 4,
+    "editor.formatOnSave": true,
+    "editor.formatOnType": false,
+    "editor.formatOnPaste": false,
+    "editor.codeActionsOnSave": {
+      "source.organizeImports": true
+    }
+  }
+}
diff --git a/poetry.lock b/poetry.lock
new file mode 100644
index 0000000..41c666d
--- /dev/null
+++ b/poetry.lock
@@ -0,0 +1,840 @@
+[[package]]
+name = "black"
+version = "22.3.0"
+description = "The uncompromising code formatter."
+category = "dev"
+optional = false
+python-versions = ">=3.6.2"
+
+[package.dependencies]
+click = ">=8.0.0"
+mypy-extensions = ">=0.4.3"
+pathspec = ">=0.9.0"
+platformdirs = ">=2"
+tomli = {version = ">=1.1.0", markers = "python_version < \"3.11\""}
+typing-extensions = {version = ">=3.10.0.0", markers = "python_version < \"3.10\""}
+
+[package.extras]
+colorama = ["colorama (>=0.4.3)"]
+d = ["aiohttp (>=3.7.4)"]
+jupyter = ["ipython (>=7.8.0)", "tokenize-rt (>=3.2.0)"]
+uvloop = ["uvloop (>=0.15.2)"]
+
+[[package]]
+name = "bleach"
+version = "4.1.0"
+description = "An easy safelist-based HTML-sanitizing tool."
+category = "dev"
+optional = false
+python-versions = ">=3.6"
+
+[package.dependencies]
+packaging = "*"
+six = ">=1.9.0"
+webencodings = "*"
+
+[[package]]
+name = "certifi"
+version = "2021.10.8"
+description = "Python package for providing Mozilla's CA Bundle."
+category = "dev"
+optional = false
+python-versions = "*"
+
+[[package]]
+name = "cffi"
+version = "1.15.0"
+description = "Foreign Function Interface for Python calling C code."
+category = "dev"
+optional = false
+python-versions = "*"
+
+[package.dependencies]
+pycparser = "*"
+
+[[package]]
+name = "charset-normalizer"
+version = "2.0.12"
+description = "The Real First Universal Charset Detector. Open, modern and actively maintained alternative to Chardet."
+category = "dev"
+optional = false
+python-versions = ">=3.5.0"
+
+[package.extras]
+unicode_backport = ["unicodedata2"]
+
+[[package]]
+name = "click"
+version = "8.1.2"
+description = "Composable command line interface toolkit"
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+
+[package.dependencies]
+colorama = {version = "*", markers = "platform_system == \"Windows\""}
+
+[[package]]
+name = "click-log"
+version = "0.4.0"
+description = "Logging integration for Click"
+category = "dev"
+optional = false
+python-versions = "*"
+
+[package.dependencies]
+click = "*"
+
+[[package]]
+name = "colorama"
+version = "0.4.4"
+description = "Cross-platform colored terminal text."
+category = "dev"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+
+[[package]]
+name = "cryptography"
+version = "36.0.2"
+description = "cryptography is a package which provides cryptographic recipes and primitives to Python developers."
+category = "dev"
+optional = false
+python-versions = ">=3.6"
+
+[package.dependencies]
+cffi = ">=1.12"
+
+[package.extras]
+docs = ["sphinx (>=1.6.5,!=1.8.0,!=3.1.0,!=3.1.1)", "sphinx-rtd-theme"]
+docstest = ["pyenchant (>=1.6.11)", "twine (>=1.12.0)", "sphinxcontrib-spelling (>=4.0.1)"]
+pep8test = ["black", "flake8", "flake8-import-order", "pep8-naming"]
+sdist = ["setuptools_rust (>=0.11.4)"]
+ssh = ["bcrypt (>=3.1.5)"]
+test = ["pytest (>=6.2.0)", "pytest-cov", "pytest-subtests", "pytest-xdist", "pretend", "iso8601", "pytz", "hypothesis (>=1.11.4,!=3.79.2)"]
+
+[[package]]
+name = "docutils"
+version = "0.18.1"
+description = "Docutils -- Python Documentation Utilities"
+category = "dev"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+
+[[package]]
+name = "dotty-dict"
+version = "1.3.0"
+description = "Dictionary wrapper for quick access to deeply nested keys."
+category = "dev"
+optional = false
+python-versions = "*"
+
+[package.dependencies]
+setuptools_scm = "*"
+
+[[package]]
+name = "gitdb"
+version = "4.0.9"
+description = "Git Object Database"
+category = "dev"
+optional = false
+python-versions = ">=3.6"
+
+[package.dependencies]
+smmap = ">=3.0.1,<6"
+
+[[package]]
+name = "gitpython"
+version = "3.1.27"
+description = "GitPython is a python library used to interact with Git repositories"
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+
+[package.dependencies]
+gitdb = ">=4.0.1,<5"
+
+[[package]]
+name = "idna"
+version = "3.3"
+description = "Internationalized Domain Names in Applications (IDNA)"
+category = "dev"
+optional = false
+python-versions = ">=3.5"
+
+[[package]]
+name = "importlib-metadata"
+version = "4.11.3"
+description = "Read metadata from Python packages"
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+
+[package.dependencies]
+zipp = ">=0.5"
+
+[package.extras]
+docs = ["sphinx", "jaraco.packaging (>=9)", "rst.linker (>=1.9)"]
+perf = ["ipython"]
+testing = ["pytest (>=6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "pytest-cov", "pytest-enabler (>=1.0.1)", "packaging", "pyfakefs", "flufl.flake8", "pytest-perf (>=0.9.2)", "pytest-black (>=0.3.7)", "pytest-mypy (>=0.9.1)", "importlib-resources (>=1.3)"]
+
+[[package]]
+name = "invoke"
+version = "1.7.0"
+description = "Pythonic task execution"
+category = "dev"
+optional = false
+python-versions = "*"
+
+[[package]]
+name = "isort"
+version = "5.10.1"
+description = "A Python utility / library to sort Python imports."
+category = "dev"
+optional = false
+python-versions = ">=3.6.1,<4.0"
+
+[package.extras]
+pipfile_deprecated_finder = ["pipreqs", "requirementslib"]
+requirements_deprecated_finder = ["pipreqs", "pip-api"]
+colors = ["colorama (>=0.4.3,<0.5.0)"]
+plugins = ["setuptools"]
+
+[[package]]
+name = "jeepney"
+version = "0.8.0"
+description = "Low-level, pure Python DBus protocol wrapper."
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+
+[package.extras]
+test = ["pytest", "pytest-trio", "pytest-asyncio (>=0.17)", "testpath", "trio", "async-timeout"]
+trio = ["trio", "async-generator"]
+
+[[package]]
+name = "keyring"
+version = "23.5.0"
+description = "Store and access your passwords safely."
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+
+[package.dependencies]
+importlib-metadata = ">=3.6"
+jeepney = {version = ">=0.4.2", markers = "sys_platform == \"linux\""}
+pywin32-ctypes = {version = "<0.1.0 || >0.1.0,<0.1.1 || >0.1.1", markers = "sys_platform == \"win32\""}
+SecretStorage = {version = ">=3.2", markers = "sys_platform == \"linux\""}
+
+[package.extras]
+docs = ["sphinx", "jaraco.packaging (>=8.2)", "rst.linker (>=1.9)", "jaraco.tidelift (>=1.4)"]
+testing = ["pytest (>=6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "pytest-cov", "pytest-enabler (>=1.0.1)", "pytest-black (>=0.3.7)", "pytest-mypy"]
+
+[[package]]
+name = "mypy-extensions"
+version = "0.4.3"
+description = "Experimental type system extensions for programs checked with the mypy typechecker."
+category = "dev"
+optional = false
+python-versions = "*"
+
+[[package]]
+name = "packaging"
+version = "21.3"
+description = "Core utilities for Python packages"
+category = "dev"
+optional = false
+python-versions = ">=3.6"
+
+[package.dependencies]
+pyparsing = ">=2.0.2,<3.0.5 || >3.0.5"
+
+[[package]]
+name = "pathspec"
+version = "0.9.0"
+description = "Utility library for gitignore style pattern matching of file paths."
+category = "dev"
+optional = false
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
+
+[[package]]
+name = "pkginfo"
+version = "1.8.2"
+description = "Query metadatdata from sdists / bdists / installed packages."
+category = "dev"
+optional = false
+python-versions = "*"
+
+[package.extras]
+testing = ["coverage", "nose"]
+
+[[package]]
+name = "platformdirs"
+version = "2.5.1"
+description = "A small Python module for determining appropriate platform-specific dirs, e.g. a \"user data dir\"."
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+
+[package.extras]
+docs = ["Sphinx (>=4)", "furo (>=2021.7.5b38)", "proselint (>=0.10.2)", "sphinx-autodoc-typehints (>=1.12)"]
+test = ["appdirs (==1.4.4)", "pytest (>=6)", "pytest-cov (>=2.7)", "pytest-mock (>=3.6)"]
+
+[[package]]
+name = "pycparser"
+version = "2.21"
+description = "C parser in Python"
+category = "dev"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+
+[[package]]
+name = "pygments"
+version = "2.11.2"
+description = "Pygments is a syntax highlighting package written in Python."
+category = "dev"
+optional = false
+python-versions = ">=3.5"
+
+[[package]]
+name = "pyparsing"
+version = "3.0.7"
+description = "Python parsing module"
+category = "dev"
+optional = false
+python-versions = ">=3.6"
+
+[package.extras]
+diagrams = ["jinja2", "railroad-diagrams"]
+
+[[package]]
+name = "python-gitlab"
+version = "3.3.0"
+description = "Interact with GitLab API"
+category = "dev"
+optional = false
+python-versions = ">=3.7.0"
+
+[package.dependencies]
+requests = ">=2.25.0"
+requests-toolbelt = ">=0.9.1"
+
+[package.extras]
+autocompletion = ["argcomplete (>=1.10.0,<3)"]
+yaml = ["PyYaml (>=5.2)"]
+
+[[package]]
+name = "python-semantic-release"
+version = "7.27.1"
+description = "Automatic Semantic Versioning for Python projects"
+category = "dev"
+optional = false
+python-versions = "*"
+
+[package.dependencies]
+click = ">=7,<9"
+click-log = ">=0.3,<1"
+dotty-dict = ">=1.3.0,<2"
+gitpython = ">=3.0.8,<4"
+invoke = ">=1.4.1,<2"
+python-gitlab = ">=2,<4"
+requests = ">=2.25,<3"
+semver = ">=2.10,<3"
+tomlkit = ">=0.10.0,<0.11.0"
+twine = ">=3,<4"
+
+[package.extras]
+dev = ["tox", "isort", "black"]
+docs = ["Sphinx (==1.3.6)"]
+mypy = ["mypy", "types-requests"]
+test = ["coverage (>=5,<6)", "pytest (>=5,<6)", "pytest-xdist (>=1,<2)", "pytest-mock (>=2,<3)", "responses (==0.13.3)", "mock (==1.3.0)"]
+
+[[package]]
+name = "pywin32-ctypes"
+version = "0.2.0"
+description = ""
+category = "dev"
+optional = false
+python-versions = "*"
+
+[[package]]
+name = "readme-renderer"
+version = "34.0"
+description = "readme_renderer is a library for rendering \"readme\" descriptions for Warehouse"
+category = "dev"
+optional = false
+python-versions = ">=3.6"
+
+[package.dependencies]
+bleach = ">=2.1.0"
+docutils = ">=0.13.1"
+Pygments = ">=2.5.1"
+
+[package.extras]
+md = ["cmarkgfm (>=0.8.0)"]
+
+[[package]]
+name = "requests"
+version = "2.27.1"
+description = "Python HTTP for Humans."
+category = "dev"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, !=3.5.*"
+
+[package.dependencies]
+certifi = ">=2017.4.17"
+charset-normalizer = {version = ">=2.0.0,<2.1.0", markers = "python_version >= \"3\""}
+idna = {version = ">=2.5,<4", markers = "python_version >= \"3\""}
+urllib3 = ">=1.21.1,<1.27"
+
+[package.extras]
+socks = ["PySocks (>=1.5.6,!=1.5.7)", "win-inet-pton"]
+use_chardet_on_py3 = ["chardet (>=3.0.2,<5)"]
+
+[[package]]
+name = "requests-toolbelt"
+version = "0.9.1"
+description = "A utility belt for advanced users of python-requests"
+category = "dev"
+optional = false
+python-versions = "*"
+
+[package.dependencies]
+requests = ">=2.0.1,<3.0.0"
+
+[[package]]
+name = "rfc3986"
+version = "2.0.0"
+description = "Validating URI References per RFC 3986"
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+
+[package.extras]
+idna2008 = ["idna"]
+
+[[package]]
+name = "secretstorage"
+version = "3.3.1"
+description = "Python bindings to FreeDesktop.org Secret Service API"
+category = "dev"
+optional = false
+python-versions = ">=3.6"
+
+[package.dependencies]
+cryptography = ">=2.0"
+jeepney = ">=0.6"
+
+[[package]]
+name = "semver"
+version = "2.13.0"
+description = "Python helper for Semantic Versioning (http://semver.org/)"
+category = "dev"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+
+[[package]]
+name = "setuptools-scm"
+version = "6.4.2"
+description = "the blessed package to manage your versions by scm tags"
+category = "dev"
+optional = false
+python-versions = ">=3.6"
+
+[package.dependencies]
+packaging = ">=20.0"
+tomli = ">=1.0.0"
+
+[package.extras]
+test = ["pytest (>=6.2)", "virtualenv (>20)"]
+toml = ["setuptools (>=42)"]
+
+[[package]]
+name = "six"
+version = "1.16.0"
+description = "Python 2 and 3 compatibility utilities"
+category = "dev"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*"
+
+[[package]]
+name = "smmap"
+version = "5.0.0"
+description = "A pure Python implementation of a sliding window memory map manager"
+category = "dev"
+optional = false
+python-versions = ">=3.6"
+
+[[package]]
+name = "tomli"
+version = "2.0.1"
+description = "A lil' TOML parser"
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+
+[[package]]
+name = "tomlkit"
+version = "0.10.1"
+description = "Style preserving TOML library"
+category = "dev"
+optional = false
+python-versions = ">=3.6,<4.0"
+
+[[package]]
+name = "tqdm"
+version = "4.64.0"
+description = "Fast, Extensible Progress Meter"
+category = "dev"
+optional = false
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,>=2.7"
+
+[package.dependencies]
+colorama = {version = "*", markers = "platform_system == \"Windows\""}
+
+[package.extras]
+dev = ["py-make (>=0.1.0)", "twine", "wheel"]
+notebook = ["ipywidgets (>=6)"]
+slack = ["slack-sdk"]
+telegram = ["requests"]
+
+[[package]]
+name = "twine"
+version = "3.8.0"
+description = "Collection of utilities for publishing packages on PyPI"
+category = "dev"
+optional = false
+python-versions = ">=3.6"
+
+[package.dependencies]
+colorama = ">=0.4.3"
+importlib-metadata = ">=3.6"
+keyring = ">=15.1"
+pkginfo = ">=1.8.1"
+readme-renderer = ">=21.0"
+requests = ">=2.20"
+requests-toolbelt = ">=0.8.0,<0.9.0 || >0.9.0"
+rfc3986 = ">=1.4.0"
+tqdm = ">=4.14"
+urllib3 = ">=1.26.0"
+
+[[package]]
+name = "typing-extensions"
+version = "4.1.1"
+description = "Backported and Experimental Type Hints for Python 3.6+"
+category = "dev"
+optional = false
+python-versions = ">=3.6"
+
+[[package]]
+name = "urllib3"
+version = "1.26.9"
+description = "HTTP library with thread-safe connection pooling, file post, and more."
+category = "dev"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, <4"
+
+[package.extras]
+brotli = ["brotlicffi (>=0.8.0)", "brotli (>=1.0.9)", "brotlipy (>=0.6.0)"]
+secure = ["pyOpenSSL (>=0.14)", "cryptography (>=1.3.4)", "idna (>=2.0.0)", "certifi", "ipaddress"]
+socks = ["PySocks (>=1.5.6,!=1.5.7,<2.0)"]
+
+[[package]]
+name = "webencodings"
+version = "0.5.1"
+description = "Character encoding aliases for legacy web content"
+category = "dev"
+optional = false
+python-versions = "*"
+
+[[package]]
+name = "zipp"
+version = "3.8.0"
+description = "Backport of pathlib-compatible object wrapper for zip files"
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+
+[package.extras]
+docs = ["sphinx", "jaraco.packaging (>=9)", "rst.linker (>=1.9)"]
+testing = ["pytest (>=6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "pytest-cov", "pytest-enabler (>=1.0.1)", "jaraco.itertools", "func-timeout", "pytest-black (>=0.3.7)", "pytest-mypy (>=0.9.1)"]
+
+[metadata]
+lock-version = "1.1"
+python-versions = "^3.8"
+content-hash = "ae3aa51ead5bae343b6c393918637a21e555527be0f857d25f38c5a332c5555f"
+
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diff --git a/poetry.toml b/poetry.toml
new file mode 100644
index 0000000..ab1033b
--- /dev/null
+++ b/poetry.toml
@@ -0,0 +1,2 @@
+[virtualenvs]
+in-project = true
diff --git a/pynbs.py b/pynbs/__init__.py
similarity index 55%
rename from pynbs.py
rename to pynbs/__init__.py
index 36bec44..34d8055 100644
--- a/pynbs.py
+++ b/pynbs/__init__.py
@@ -1,293 +1,303 @@
-from __future__ import print_function, division, absolute_import
-
-try:
-    from builtins import range
-except ImportError:
-    range = xrange
-
-from struct import Struct
-from collections import namedtuple
-
-
-__all__ = ['read', 'new_file', 'Parser', 'Writer', 'File', 'Header',
-           'Note', 'Layer', 'Instrument']
-
-CURRENT_NBS_VERSION = 5
-
-BYTE = Struct('<B')
-SHORT = Struct('<H')
-SSHORT = Struct('<h')
-INT = Struct('<I')
-
-
-
-Instrument = namedtuple('Instrument', ['id', 'name', 'file', 'pitch',
-                                       'press_key'])
-
-
-class Note(namedtuple('Note', ['tick', 'layer', 'instrument', 'key',
-                      'velocity', 'panning', 'pitch'])):
-    def __new__(cls, tick, layer, instrument, key, velocity=100,
-               panning=0, pitch=0):
-        return super().__new__(cls, tick, layer, instrument, key,
-                               velocity, panning, pitch)
-
-class Layer(namedtuple('Layer', ['id', 'name', 'lock', 'volume', 'panning'])):
-    def __new__(cls, id, name="", lock=False, volume=100, panning=0):
-        return super().__new__(cls, id, name, lock, volume, panning)
-
-
-def read(filename):
-    with open(filename, 'rb') as buff:
-        return Parser(buff).read_file()
-
-
-def new_file(**header):
-    return File(Header(**header), [], [Layer(0, '', False, 100, 0)], [])
-
-
-class Header(object):
-    def __init__(self, **header):
-        header_values = {
-            'version':              header.get('version', CURRENT_NBS_VERSION),
-            'default_instruments':  header.get('default_instruments', 16),
-            'song_length':          header.get('song_length', 0),
-            'song_layers':          header.get('song_layers', 0),
-            'song_name':            header.get('song_name', ''),
-            'song_author':          header.get('song_author', ''),
-            'original_author':      header.get('original_author', ''),
-            'description':          header.get('description', ''),
-
-            'tempo':                header.get('tempo', 10.0),
-            'auto_save':            header.get('auto_save', False),
-            'auto_save_duration':   header.get('auto_save_duration', 10),
-            'time_signature':       header.get('time_signature', 4),
-
-            'minutes_spent':        header.get('minutes_spent', 0),
-            'left_clicks':          header.get('left_clicks', 0),
-            'right_clicks':         header.get('right_clicks', 0),
-            'blocks_added':         header.get('blocks_added', 0),
-            'blocks_removed':       header.get('blocks_removed', 0),
-            'song_origin':          header.get('song_origin', ''),
-
-            'loop':                 header.get('loop', False),
-            'max_loop_count':       header.get('max_loop_count', 0),
-            'loop_start':           header.get('loop_start', 0)
-        }
-
-        for key, value in header_values.items():
-            setattr(self, key, value)
-
-
-class File(object):
-    def __init__(self, header, notes, layers, instruments):
-        self.header = header
-        self.notes = notes
-        self.layers = layers
-        self.instruments = instruments
-
-    def update_header(self, version):
-        self.header.version = version
-        if self.notes:
-            self.header.song_length = self.notes[-1].tick
-        self.header.song_layers = len(self.layers)
-
-    def save(self, filename, version=CURRENT_NBS_VERSION):
-        self.update_header(version)
-        with open(filename, 'wb') as buff:
-            Writer(buff).encode_file(self, version)
-
-    def __iter__(self):
-        if not self.notes:
-            return
-        chord = []
-        current_tick = self.notes[0].tick
-
-        for note in sorted(self.notes, key=lambda n: n.tick):
-            if note.tick == current_tick:
-                chord.append(note)
-            else:
-                chord.sort(key=lambda n: n.layer)
-                yield current_tick, chord
-                current_tick, chord = note.tick, [note]
-        yield current_tick, chord
-
-
-class Parser(object):
-    def __init__(self, buff):
-        self.buffer = buff
-
-    def read_file(self):
-        values = self.parse_header()
-        header = Header(**values)
-        version = values['version']
-        return File(header, list(self.parse_notes(version)),
-                    list(self.parse_layers(header.song_layers, version)),
-                    list(self.parse_instruments(version)))
-
-    def read_numeric(self, fmt):
-        return fmt.unpack(self.buffer.read(fmt.size))[0]
-
-    def read_string(self):
-        length = self.read_numeric(INT)
-        return self.buffer.read(length).decode(encoding='cp1252')
-
-    def jump(self):
-        value = -1
-        while True:
-            jump = self.read_numeric(SHORT)
-            if not jump:
-                break
-            value += jump
-            yield value
-
-    def parse_header(self):
-        song_length = self.read_numeric(SHORT)
-        if song_length == 0:
-            # A song length of 0 indicates the Open Note Block Studio format
-            version = self.read_numeric(BYTE)
-        else:
-            version = 0
-
-        return {
-            'version':             version,
-            'default_instruments': self.read_numeric(BYTE)  if version > 0 else 10,
-            'song_length':         self.read_numeric(SHORT) if version >= 3 else song_length,
-            'song_layers':         self.read_numeric(SHORT),
-            'song_name':           self.read_string(),
-            'song_author':         self.read_string(),
-            'original_author':     self.read_string(),
-            'description':         self.read_string(),
-
-            'tempo':               self.read_numeric(SHORT) / 100.0,
-            'auto_save':           self.read_numeric(BYTE) == 1,
-            'auto_save_duration':  self.read_numeric(BYTE),
-            'time_signature':      self.read_numeric(BYTE),
-
-            'minutes_spent':       self.read_numeric(INT),
-            'left_clicks':         self.read_numeric(INT),
-            'right_clicks':        self.read_numeric(INT),
-            'blocks_added':        self.read_numeric(INT),
-            'blocks_removed':      self.read_numeric(INT),
-            'song_origin':         self.read_string(),
-            'loop':                self.read_numeric(BYTE) == 1 if version >= 4 else False,
-            'max_loop_count':      self.read_numeric(BYTE)      if version >= 4 else 0,
-            'loop_start':          self.read_numeric(SHORT)     if version >= 4 else 0
-        }
-
-    def parse_notes(self, version):
-        for current_tick in self.jump():
-            for current_layer in self.jump():
-                instrument = self.read_numeric(BYTE)
-                key        = self.read_numeric(BYTE)
-                velocity   = self.read_numeric(BYTE)       if version >= 4 else 100
-                panning    = self.read_numeric(BYTE) - 100 if version >= 4 else 0
-                pitch      = self.read_numeric(SSHORT)     if version >= 4 else 0
-                yield Note(current_tick, current_layer, instrument,
-                           key, velocity, panning, pitch)
-
-    def parse_layers(self, layers_count, version):
-        for i in range(layers_count):
-            name    = self.read_string()
-            lock    = self.read_numeric(BYTE) == 1  if version >= 4 else False
-            volume  = self.read_numeric(BYTE)
-            panning = self.read_numeric(BYTE) - 100 if version >= 2 else 0
-            yield Layer(i, name, lock, volume, panning)
-
-    def parse_instruments(self, version):
-        for i in range(self.read_numeric(BYTE)):
-            name       = self.read_string()
-            sound_file = self.read_string()
-            pitch      = self.read_numeric(BYTE)
-            press_key  = self.read_numeric(BYTE) == 1
-            yield Instrument(i, name, sound_file, pitch, press_key)
-
-
-class Writer(object):
-    def __init__(self, buff):
-        self.buffer = buff
-
-    def encode_file(self, nbs_file, version):
-        self.write_header(nbs_file, version)
-        self.write_notes(nbs_file, version)
-        self.write_layers(nbs_file, version)
-        self.write_instruments(nbs_file, version)
-
-    def encode_numeric(self, fmt, value):
-        self.buffer.write(fmt.pack(value))
-
-    def encode_string(self, value):
-        self.encode_numeric(INT, len(value))
-        self.buffer.write(value.encode(encoding='cp1252'))
-
-    def write_header(self, nbs_file, version):
-        header = nbs_file.header
-
-        if version > 0:
-            self.encode_numeric(SHORT, 0)
-            self.encode_numeric(BYTE, version)
-            self.encode_numeric(BYTE, header.default_instruments)
-        else:
-            self.encode_numeric(SHORT, header.song_length)
-        if version >= 3:
-            self.encode_numeric(SHORT, header.song_length)
-        self.encode_numeric(SHORT, header.song_layers)
-        self.encode_string(header.song_name)
-        self.encode_string(header.song_author)
-        self.encode_string(header.original_author)
-        self.encode_string(header.description)
-
-        self.encode_numeric(SHORT, int(header.tempo * 100))
-        self.encode_numeric(BYTE, int(header.auto_save))
-        self.encode_numeric(BYTE, header.auto_save_duration)
-        self.encode_numeric(BYTE, header.time_signature)
-
-        self.encode_numeric(INT, header.minutes_spent)
-        self.encode_numeric(INT, header.left_clicks)
-        self.encode_numeric(INT, header.right_clicks)
-        self.encode_numeric(INT, header.blocks_added)
-        self.encode_numeric(INT, header.blocks_removed)
-        self.encode_string(header.song_origin)
-
-        if version >= 4:
-            self.encode_numeric(BYTE, int(header.loop))
-            self.encode_numeric(BYTE, header.max_loop_count)
-            self.encode_numeric(SHORT, header.loop_start)
-
-    def write_notes(self, nbs_file, version):
-        current_tick = -1
-
-        for tick, chord in nbs_file:
-            self.encode_numeric(SHORT, tick - current_tick)
-            current_tick = tick
-            current_layer = -1
-
-            for note in chord:
-                self.encode_numeric(SHORT, note.layer - current_layer)
-                current_layer = note.layer
-                self.encode_numeric(BYTE, note.instrument)
-                self.encode_numeric(BYTE, note.key)
-                if version >= 4:
-                    self.encode_numeric(BYTE, note.velocity)
-                    self.encode_numeric(BYTE, note.panning + 100)
-                    self.encode_numeric(SSHORT, note.pitch)
-
-            self.encode_numeric(SHORT, 0)
-        self.encode_numeric(SHORT, 0)
-
-    def write_layers(self, nbs_file, version):
-        for layer in nbs_file.layers:
-            self.encode_string(layer.name)
-            if version >= 4:
-                self.encode_numeric(BYTE, int(layer.lock))
-            self.encode_numeric(BYTE, layer.volume)
-            if version >= 2:
-                self.encode_numeric(BYTE, layer.panning + 100)
-
-    def write_instruments(self, nbs_file, version):
-        self.encode_numeric(BYTE, len(nbs_file.instruments))
-        for instrument in nbs_file.instruments:
-            self.encode_string(instrument.name)
-            self.encode_string(instrument.file)
-            self.encode_numeric(BYTE, instrument.pitch)
-            self.encode_numeric(BYTE, int(instrument.press_key))
+__version__ = "0.4.2"
+
+from collections import namedtuple
+from struct import Struct
+
+__all__ = [
+    "read",
+    "new_file",
+    "Parser",
+    "Writer",
+    "File",
+    "Header",
+    "Note",
+    "Layer",
+    "Instrument",
+]
+
+CURRENT_NBS_VERSION = 5
+
+BYTE = Struct("<B")
+SHORT = Struct("<H")
+SSHORT = Struct("<h")
+INT = Struct("<I")
+
+
+Instrument = namedtuple("Instrument", ["id", "name", "file", "pitch", "press_key"])
+
+
+class Note(
+    namedtuple(
+        "Note", ["tick", "layer", "instrument", "key", "velocity", "panning", "pitch"]
+    )
+):
+    def __new__(cls, tick, layer, instrument, key, velocity=100, panning=0, pitch=0):
+        return super().__new__(
+            cls, tick, layer, instrument, key, velocity, panning, pitch
+        )
+
+
+class Layer(namedtuple("Layer", ["id", "name", "lock", "volume", "panning"])):
+    def __new__(cls, id, name="", lock=False, volume=100, panning=0):
+        return super().__new__(cls, id, name, lock, volume, panning)
+
+
+def read(filename):
+    with open(filename, "rb") as buff:
+        return Parser(buff).read_file()
+
+
+def new_file(**header):
+    return File(Header(**header), [], [Layer(0, "", False, 100, 0)], [])
+
+
+class Header(object):
+    def __init__(self, **header):
+        header_values = {
+            "version": header.get("version", CURRENT_NBS_VERSION),
+            "default_instruments": header.get("default_instruments", 16),
+            "song_length": header.get("song_length", 0),
+            "song_layers": header.get("song_layers", 0),
+            "song_name": header.get("song_name", ""),
+            "song_author": header.get("song_author", ""),
+            "original_author": header.get("original_author", ""),
+            "description": header.get("description", ""),
+            "tempo": header.get("tempo", 10.0),
+            "auto_save": header.get("auto_save", False),
+            "auto_save_duration": header.get("auto_save_duration", 10),
+            "time_signature": header.get("time_signature", 4),
+            "minutes_spent": header.get("minutes_spent", 0),
+            "left_clicks": header.get("left_clicks", 0),
+            "right_clicks": header.get("right_clicks", 0),
+            "blocks_added": header.get("blocks_added", 0),
+            "blocks_removed": header.get("blocks_removed", 0),
+            "song_origin": header.get("song_origin", ""),
+            "loop": header.get("loop", False),
+            "max_loop_count": header.get("max_loop_count", 0),
+            "loop_start": header.get("loop_start", 0),
+        }
+
+        for key, value in header_values.items():
+            setattr(self, key, value)
+
+
+class File(object):
+    def __init__(self, header, notes, layers, instruments):
+        self.header = header
+        self.notes = notes
+        self.layers = layers
+        self.instruments = instruments
+
+    def update_header(self, version):
+        self.header.version = version
+        if self.notes:
+            self.header.song_length = self.notes[-1].tick
+        self.header.song_layers = len(self.layers)
+
+    def save(self, filename, version=CURRENT_NBS_VERSION):
+        self.update_header(version)
+        with open(filename, "wb") as buff:
+            Writer(buff).encode_file(self, version)
+
+    def __iter__(self):
+        if not self.notes:
+            return
+        chord = []
+        current_tick = self.notes[0].tick
+
+        for note in sorted(self.notes, key=lambda n: n.tick):
+            if note.tick == current_tick:
+                chord.append(note)
+            else:
+                chord.sort(key=lambda n: n.layer)
+                yield current_tick, chord
+                current_tick, chord = note.tick, [note]
+        yield current_tick, chord
+
+
+class Parser(object):
+    def __init__(self, buff):
+        self.buffer = buff
+
+    def read_file(self):
+        values = self.parse_header()
+        header = Header(**values)
+        version = values["version"]
+        return File(
+            header,
+            list(self.parse_notes(version)),
+            list(self.parse_layers(header.song_layers, version)),
+            list(self.parse_instruments(version)),
+        )
+
+    def read_numeric(self, fmt):
+        return fmt.unpack(self.buffer.read(fmt.size))[0]
+
+    def read_string(self):
+        length = self.read_numeric(INT)
+        return self.buffer.read(length).decode(encoding="cp1252")
+
+    def jump(self):
+        value = -1
+        while True:
+            jump = self.read_numeric(SHORT)
+            if not jump:
+                break
+            value += jump
+            yield value
+
+    def parse_header(self):
+        song_length = self.read_numeric(SHORT)
+        if song_length == 0:
+            # A song length of 0 indicates the Open Note Block Studio format
+            version = self.read_numeric(BYTE)
+        else:
+            version = 0
+
+        return {
+            "version": version,
+            "default_instruments": self.read_numeric(BYTE) if version > 0 else 10,
+            "song_length": self.read_numeric(SHORT) if version >= 3 else song_length,
+            "song_layers": self.read_numeric(SHORT),
+            "song_name": self.read_string(),
+            "song_author": self.read_string(),
+            "original_author": self.read_string(),
+            "description": self.read_string(),
+            "tempo": self.read_numeric(SHORT) / 100.0,
+            "auto_save": self.read_numeric(BYTE) == 1,
+            "auto_save_duration": self.read_numeric(BYTE),
+            "time_signature": self.read_numeric(BYTE),
+            "minutes_spent": self.read_numeric(INT),
+            "left_clicks": self.read_numeric(INT),
+            "right_clicks": self.read_numeric(INT),
+            "blocks_added": self.read_numeric(INT),
+            "blocks_removed": self.read_numeric(INT),
+            "song_origin": self.read_string(),
+            "loop": self.read_numeric(BYTE) == 1 if version >= 4 else False,
+            "max_loop_count": self.read_numeric(BYTE) if version >= 4 else 0,
+            "loop_start": self.read_numeric(SHORT) if version >= 4 else 0,
+        }
+
+    def parse_notes(self, version):
+        for current_tick in self.jump():
+            for current_layer in self.jump():
+                instrument = self.read_numeric(BYTE)
+                key = self.read_numeric(BYTE)
+                velocity = self.read_numeric(BYTE) if version >= 4 else 100
+                panning = self.read_numeric(BYTE) - 100 if version >= 4 else 0
+                pitch = self.read_numeric(SSHORT) if version >= 4 else 0
+                yield Note(
+                    current_tick,
+                    current_layer,
+                    instrument,
+                    key,
+                    velocity,
+                    panning,
+                    pitch,
+                )
+
+    def parse_layers(self, layers_count, version):
+        for i in range(layers_count):
+            name = self.read_string()
+            lock = self.read_numeric(BYTE) == 1 if version >= 4 else False
+            volume = self.read_numeric(BYTE)
+            panning = self.read_numeric(BYTE) - 100 if version >= 2 else 0
+            yield Layer(i, name, lock, volume, panning)
+
+    def parse_instruments(self, version):
+        for i in range(self.read_numeric(BYTE)):
+            name = self.read_string()
+            sound_file = self.read_string()
+            pitch = self.read_numeric(BYTE)
+            press_key = self.read_numeric(BYTE) == 1
+            yield Instrument(i, name, sound_file, pitch, press_key)
+
+
+class Writer(object):
+    def __init__(self, buff):
+        self.buffer = buff
+
+    def encode_file(self, nbs_file, version):
+        self.write_header(nbs_file, version)
+        self.write_notes(nbs_file, version)
+        self.write_layers(nbs_file, version)
+        self.write_instruments(nbs_file, version)
+
+    def encode_numeric(self, fmt, value):
+        self.buffer.write(fmt.pack(value))
+
+    def encode_string(self, value):
+        self.encode_numeric(INT, len(value))
+        self.buffer.write(value.encode(encoding="cp1252"))
+
+    def write_header(self, nbs_file, version):
+        header = nbs_file.header
+
+        if version > 0:
+            self.encode_numeric(SHORT, 0)
+            self.encode_numeric(BYTE, version)
+            self.encode_numeric(BYTE, header.default_instruments)
+        else:
+            self.encode_numeric(SHORT, header.song_length)
+        if version >= 3:
+            self.encode_numeric(SHORT, header.song_length)
+        self.encode_numeric(SHORT, header.song_layers)
+        self.encode_string(header.song_name)
+        self.encode_string(header.song_author)
+        self.encode_string(header.original_author)
+        self.encode_string(header.description)
+
+        self.encode_numeric(SHORT, int(header.tempo * 100))
+        self.encode_numeric(BYTE, int(header.auto_save))
+        self.encode_numeric(BYTE, header.auto_save_duration)
+        self.encode_numeric(BYTE, header.time_signature)
+
+        self.encode_numeric(INT, header.minutes_spent)
+        self.encode_numeric(INT, header.left_clicks)
+        self.encode_numeric(INT, header.right_clicks)
+        self.encode_numeric(INT, header.blocks_added)
+        self.encode_numeric(INT, header.blocks_removed)
+        self.encode_string(header.song_origin)
+
+        if version >= 4:
+            self.encode_numeric(BYTE, int(header.loop))
+            self.encode_numeric(BYTE, header.max_loop_count)
+            self.encode_numeric(SHORT, header.loop_start)
+
+    def write_notes(self, nbs_file, version):
+        current_tick = -1
+
+        for tick, chord in nbs_file:
+            self.encode_numeric(SHORT, tick - current_tick)
+            current_tick = tick
+            current_layer = -1
+
+            for note in chord:
+                self.encode_numeric(SHORT, note.layer - current_layer)
+                current_layer = note.layer
+                self.encode_numeric(BYTE, note.instrument)
+                self.encode_numeric(BYTE, note.key)
+                if version >= 4:
+                    self.encode_numeric(BYTE, note.velocity)
+                    self.encode_numeric(BYTE, note.panning + 100)
+                    self.encode_numeric(SSHORT, note.pitch)
+
+            self.encode_numeric(SHORT, 0)
+        self.encode_numeric(SHORT, 0)
+
+    def write_layers(self, nbs_file, version):
+        for layer in nbs_file.layers:
+            self.encode_string(layer.name)
+            if version >= 4:
+                self.encode_numeric(BYTE, int(layer.lock))
+            self.encode_numeric(BYTE, layer.volume)
+            if version >= 2:
+                self.encode_numeric(BYTE, layer.panning + 100)
+
+    def write_instruments(self, nbs_file, version):
+        self.encode_numeric(BYTE, len(nbs_file.instruments))
+        for instrument in nbs_file.instruments:
+            self.encode_string(instrument.name)
+            self.encode_string(instrument.file)
+            self.encode_numeric(BYTE, instrument.pitch)
+            self.encode_numeric(BYTE, int(instrument.press_key))
diff --git a/pynbs/py.typed b/pynbs/py.typed
new file mode 100644
index 0000000..e69de29
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..a733805
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,44 @@
+[tool.poetry]
+name = "pynbs"
+version = "0.4.2"
+description = "A simple python library to read and write .nbs files from Note Block Studio"
+authors = ["Valentin Berlier <berlier.v@gmail.com>"]
+license = "MIT"
+
+homepage = "https://github.com/OpenNBS/pynbs"
+repository = "https://github.com/OpenNBS/pynbs"
+documentation = "https://github.com/OpenNBS/pynbs"
+
+readme = "README.md"
+
+keywords = [
+  "minecraft",
+  "note-block-studio",
+  "nbs-files"
+]
+
+include = ["pynbs/py.typed"]
+
+[tool.poetry.dependencies]
+python = "^3.8"
+
+[tool.poetry.dev-dependencies]
+black = "^22.3.0"
+isort = "^5.10.1"
+python-semantic-release = "^7.27.1"
+
+[tool.black]
+target-version = ["py38"]
+
+[tool.isort]
+profile = "black"
+
+[tool.semantic_release]
+branch = "main"
+version_variable = ["pynbs/__init__.py:__version__"]
+version_toml = "pyproject.toml:tool.poetry.version"
+build_command = "poetry build"
+
+[build-system]
+requires = ["poetry-core>=1.0.0"]
+build-backend = "poetry.core.masonry.api"
diff --git a/setup.cfg b/setup.cfg
deleted file mode 100644
index 3c6e79c..0000000
--- a/setup.cfg
+++ /dev/null
@@ -1,2 +0,0 @@
-[bdist_wheel]
-universal=1
diff --git a/setup.py b/setup.py
index 71e2416..16cee32 100644
--- a/setup.py
+++ b/setup.py
@@ -1,39 +1,8 @@
-from setuptools import setup
+#!/usr/bin/env python
 
+# This is a shim to allow GitHub to detect the package. The build is done with poetry.
 
-with open('README.md') as readme:
-    long_description = readme.read()
+import setuptools
 
-
-setup(
-    name='pynbs',
-    version='0.5.0',
-    license='MIT',
-    description='A simple python library to read and write .nbs files from Note Block Studio',
-    long_description=long_description,
-    long_description_content_type='text/markdown',
-
-    author='Valentin Berlier',
-    author_email='berlier.v@gmail.com',
-    url='https://github.com/OpenNBS/pynbs',
-
-    platforms=['any'],
-    python_requires='>=2.7',
-    classifiers=[
-        'Development Status :: 4 - Beta',
-        'Intended Audience :: Developers',
-        'Topic :: Software Development :: Libraries :: Python Modules',
-        'License :: OSI Approved :: MIT License',
-        'Operating System :: OS Independent',
-        'Programming Language :: Python :: 2',
-        'Programming Language :: Python :: 2.7',
-        'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.6',
-        'Programming Language :: Python :: 3.7',
-        'Programming Language :: Python :: 3.8',
-        'Programming Language :: Python :: 3.9',
-    ],
-    keywords='note-block-studio minecraft nbs-files',
-
-    py_modules=['pynbs'],
-)
+if __name__ == "__main__":
+    setuptools.setup(name="pynbs")