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kennethreitz
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Score.to_lilypond() gains chord_names/fretboards/tab flags (plus chord_part and fretboard) that render a chord part as a lead sheet from a single \chordmode block. Fret diagrams use PyTheory's own Fretboard voicings via \storePredefinedDiagram, so they match what it would actually play rather than LilyPond's computed defaults. New helper _chord_to_chordmode(chord) derives the chordmode modifier from Chord.quality (faithful even when the symbol re-spells, e.g. C6 -> Am7). Default output is unchanged. Verified by compiling the output with LilyPond 2.26 (lead sheet + a 17-quality battery, incl. m7+ and aug7). Adds 7 tests (string assertions + a lilypond-compile test marked slow). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
PyTheory for Claude Code
Compose music straight from a conversation. This is the official Claude Code plugin marketplace for PyTheory — say "write me a bossa nova in G minor" and Claude builds it, plays it, and exports MIDI or WAV, all in pure Python with no samples, plugins, or DAW required.
This repository is generated from the pytheory repo (the source of truth) via
make sync-skill. Edit the skill there, not here.
Install
In Claude Code:
/plugin marketplace add kennethreitz/pytheory-skill
/plugin install composing-with-pytheory@pytheory
Then just ask for music — "make a four-chord pop loop", "lay down a funk beat with ghost-note snares", "turn ii–V–I in D minor into a short arrangement and save the MIDI".
You'll also want PyTheory itself available where Claude runs:
pip install pytheory
What's inside
| Plugin | What it does |
|---|---|
| composing-with-pytheory | A skill that teaches Claude PyTheory's composition API — Score, parts, progressions, melodies, drums, layering — plus the house style (subtle detune, 0.2 humanize, sine/triangle love) and how to render to audio/MIDI/MusicXML/LilyPond/tab. |
Links
- PyTheory docs — https://pytheory.org
- PyTheory source — https://github.com/kennethreitz/pytheory
- Try it in your browser — https://playground.pytheory.org
Privacy
This plugin collects no data — see PRIVACY.md.
License
MIT © Kenneth Reitz