compose

name: compose description: "Create and edit MIDI files. Add notes, change tempo and time signature, transpose, quantize, and save."

/compose — Create & Edit MIDI Files

Use the Mozart Pi tools to create MIDI files from scratch or edit existing ones.

Quick Start

/compose new_song.mid

Creating a New MIDI File

1. Create with mozart_create_midi — set name, tempo, time signature
2. Add tracks with mozart_add_track — name them and assign instruments
3. Add notes with mozart_add_notes — specify measure, beat, pitch, duration, velocity
4. Save with mozart_save_midi — write to disk

Editing an Existing File

1. Load with mozart_load_midi
2. Browse with mozart_get_measures to understand the structure
3. Edit — use mozart_add_notes, mozart_delete_notes, mozart_transpose, mozart_quantize
4. Change tempo/time sig with mozart_set_tempo, mozart_set_time_signature
5. Save with mozart_save_midi

Examples

Create a simple melody

mozart_create_midi alias="demo" name="Demo Song" bpm=120 file_path="demo.mid"
mozart_add_track alias="demo" name="Piano" instrument=0
mozart_add_notes alias="demo" track=0 notes=[
  {"measure": 1, "beat": 1, "note_name": "C4", "duration_beats": 1, "velocity": 80},
  {"measure": 1, "beat": 2, "note_name": "E4", "duration_beats": 1, "velocity": 80},
  {"measure": 1, "beat": 3, "note_name": "G4", "duration_beats": 1, "velocity": 80},
  {"measure": 1, "beat": 4, "note_name": "C5", "duration_beats": 1, "velocity": 90}
]
mozart_save_midi alias="demo"

Transpose a track up a perfect fifth

mozart_transpose alias="song" track=0 semitones=7

Quantize to eighth notes

mozart_quantize alias="song" track=1 grid_beats=0.5

Delete notes in measures 5-8 and rewrite

mozart_delete_notes alias="song" track=0 measure_start=5 measure_end=8
mozart_add_notes alias="song" track=0 notes=[...]
mozart_save_midi alias="song"

Change tempo mid-song

mozart_set_tempo alias="song" bpm=140 at_tick=1920

Tool Reference

General MIDI Instruments (Common)

Tips

• Note names follow scientific pitch notation: C4 is middle C
• Beats are 1-based within a measure (beat 1 = downbeat)
• Fractional beats work: beat 1.5 = the "and" of beat 1
• Velocity ranges from 1 (barely audible) to 127 (maximum)
• Always mozart_save_midi after editing — changes are in-memory until saved
• Use mozart_get_measures to verify your edits look correct before saving