mozart

mozart-claude-plugin

MIDI plugin for Claude Code — load, analyze, edit, and compose MIDI files with musical intelligence.

Features

• Load & parse MIDI files with full structural awareness
• Time signature and tempo aware — understands measures, beats, and tempo changes
• Navigate by measure — seek to any measure or phrase, not just byte offsets
• Search notes — find notes by pitch, name, track, or measure range
• Edit in place — add, delete, transpose, and quantize notes
• Compose from scratch — create new MIDI files with tracks, instruments, and notes
• Save changes — write edits back to standard MIDI files

Install

After adding the fingerskier marketplace:

claude plugin marketplace add fingerskier/claude-plugins
claude plugin install mozart@fingerskier-plugins

Or install directly:

claude mcp add mozart -- npx -y mozart-claude-plugin mcp

Skills

Skill	Description
/play	Load and explore MIDI files — analyze structure, browse measures, search notes
/compose	Create and edit MIDI — add notes, change tempo, transpose, quantize, save

MCP Tools

Tool	Description
load_midi	Parse a MIDI file and load it into memory
midi_info	Get detailed metadata — tempo, time sig, tracks, instruments, pitch ranges
get_measures	Get notes organized by measure (time-signature aware)
search_notes	Search for notes by pitch, name, track, or measure range
add_notes	Insert notes at measure/beat positions
delete_notes	Remove notes from a measure range
transpose	Shift notes up or down by semitones
quantize	Snap note timing to a rhythmic grid
set_tempo	Set or change tempo at any point
set_time_signature	Set or change time signature
add_track	Add a new track with name and instrument
set_instrument	Change a track's General MIDI instrument
create_midi	Create a new empty MIDI file
save_midi	Write the MIDI file to disk
list_loaded	Show all loaded files
unload_midi	Remove a file from memory

Example Usage

> Load song.mid and show me what's in the first 4 measures

> Create a 12-bar blues in C at 120 BPM with piano and bass

> Transpose the melody up a minor third

> Quantize track 2 to eighth notes

> Show me all the C# notes in the bass track

License

MIT