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Open-source Claude skill enables headless, note-by-note music composition with 5 models

·2026.11.12 01:56

Key point

The MIT-licensed tool outputs editable MIDI, stems, and project files, with examples generated by Claude Fable 5.2, Opus 5.5, Sonnet 5.5, and GPT-6 models.

Details

  • Open-source skill (v0.6.0) allows AI agents to compose and render music headlessly by writing out every note and synthesizing it, rather than using audio-generation models.
  • Output includes MP3, MIDI, individual stems, and editable project files, with no usage restrictions including commercial sales.
  • Demonstrated with 7 pieces from a single prompt each, featuring models such as Claude Fable 5.2, Claude Opus 5.5, Claude Sonnet 5.5, GPT-6 Astra, and GPT-6 Luna.
  • Built primarily using Claude Code, with the rendering engine, mixing, and mastering tools written in Python by the AI.
  • Includes a sound library with Surge XT and requires significant disk space; does not support vocals and rendering time scales with effort settings and piece length.
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