# MusicGen

Generate electronic music without AI

## Requirements

- Rust 1.87.0+

## Build

```bash
git clone <repository-url>
cd music
cargo build --release
```

## TOML Configuration

Create declaritive songs with structured TOML:

```bash
cargo run --bin musicgen toml examples/enchanted.toml
```

### From Binary
```bash
./target/release/musicgen toml examples/enchanted.toml
```

### Basic TOML Structure

```toml
[composition]
key = 60
scale = "minor"
tempo = 85.0
measures = 16

[[tracks]]
name = "bass"
instrument = "sine"
volume = 0.8

[tracks.pattern]
type = "custom"

[[tracks.pattern.steps]]
time = 0.0
note = "C2"
duration = 0.75
velocity = 0.9

[export]
filename = "my_song"
format = "wav"
```

### Definitions

- **Track** - Each track like a single instrument in a band (like the bass or drums)
- **Pattern** - The sequence of notes that a track plays.
- **Steps** - Individual notes in your pattern.
- **Velocity** - How loud to play the note (0.0 = whisper quiet, 1.0 = full volume)
- **Loop Length** - How long your pattern is before it repeats (in beats)
- **Measures** - Groups of beats (usually 4 beats = 1 measure). Like counting "1-2-3-4, 1-2-3-4"
- **Tempo/BPM** - How fast the song goes. 120 BPM = 120 beats per minute
- **Key** - What note the song is "centered" around (like C major or A minor)
- **MIDI Notes** - Just numbers for musical notes. 60 = middle C, 69 = A above middle C. Or use note names like "C4" or "A4"
- **Duration** - How long a note plays for (in beats). 1.0 = one full beat, 0.5 = half a beat
- **Waveforms** - The "shape" of the sound. Sine = smooth/warm, Square = retro video game, Sawtooth = buzzy/bright
- **Effects** - Things that change how your track sounds. Lowpass = makes it muffled, Delay = adds echo
- **Time Signature** - How many beats per measure. 4/4 means 4 beats per measure (most common)
- **Chord** - Multiple notes played together. Like C major = C + E + G played at the same time
- **Arpeggio** - Playing chord notes one after another instead of all together

### Available Options

- **Instruments**: `sine`, `square`, `sawtooth`, `triangle`, `noise`, `piano`
- **Scales**: `major`, `minor`, `dorian`, `pentatonic`, `blues`, `chromatic`
- **Keys**: MIDI numbers (60 = C4) or note names (`"C4"`, `"F#3"`)
- **Pattern Types**: `custom`, `chord`, `arpeggio`, `sequence`
- **Effects**: `lowpass`, `highpass`, `delay`, `reverb`, `chorus`, `distortion`

### Track Configuration

```toml
[[tracks]]
name = "bass"
instrument = "sine"
volume = 0.8

[tracks.pattern]
type = "custom"
loop_length = 4.0

[[tracks.pattern.steps]]
time = 0.0
note = "C2"
duration = 0.75
velocity = 0.9

[[tracks.pattern.steps]]
time = 2.0
note = "G2"
duration = 0.75
velocity = 0.8

[[tracks.effects]]
type = "lowpass"
cutoff = 400.0
resonance = 1.8

[[tracks]]
name = "drums"
instrument = "noise"
volume = 0.6

[tracks.pattern]
type = "custom"

[[tracks.pattern.steps]]
time = 0.0
note = "C1"
duration = 0.1
velocity = 1.0

[[tracks.pattern.steps]]
time = 1.0
note = "E3"
duration = 0.05
velocity = 0.7
```

See `composition-schema` for a complete example and the full schema.

## Output

All audio files are saved to the `output/` directory.