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# Metadata Extraction & Default Settings

## How Metadata is Extracted

The system uses a **3-tier priority system** to determine track metadata:

1. **API Response** (Highest Priority) - If the music generation API returns metadata, it's used first
2. **Prompt Parsing** (Second Priority) - If API doesn't provide, the system parses your prompt text
3. **Default Values** (Lowest Priority) - If neither API nor prompt contains the info, defaults are used

## Default Settings

When metadata is not provided by the API or found in your prompt, these defaults are applied:

| Field | Default Value | Notes |
|-------|--------------|-------|
| **Genre** | `Electronic` | Most common genre |
| **BPM** | `Random(80-160)` | Randomly selected between 80-160 BPM |
| **Key** | `C major` | Most common musical key |
| **Mood** | `neutral` | Neutral/balanced mood |
| **Time Signature** | `4/4` | Standard time signature |
| **Energy** | `medium` | Medium energy level |
| **Instruments** | `['synthesizer']` | Default instrument array |

## Prompt Parsing Formats Supported

The system can extract metadata from your prompt in these formats:

### BPM/Tempo
- `BPM: 150`
- `150 BPM`
- `tempo: 150`
- `Tempo 150`

### Genre/Style
- `Style: Psytrance / Psy Chill`
- `Genre: Electronic`
- Keywords: `psytrance`, `psy chill`, `electronic`, `house`, `techno`, `pop`, `rock`, `jazz`, etc.

### Key
- `Key: 6B – D Major`
- `Key: D Major`
- `D Major` (standalone)
- Supports: C, D, E, F, G, A, B (with #/b) + major/minor

### Mood/Theme
- `Theme: Love as Frequency`
- `Mood: energetic`
- Keywords: `love` → Romantic, `unity` → Peaceful, `frequency` → Energetic
- Also: happy, sad, energetic, chill, relaxing, aggressive, uplifting, dark, etc.

## Example

**Your Prompt:**
```
Key: 6B – D Major BPM: 150 Style: Psytrance / Psy Chill Theme: Love as Frequency — Unity as V...
```

**What Gets Extracted:**
- ✅ **BPM**: `150` (from "BPM: 150")
- ✅ **Genre**: `Psytrance` (from "Style: Psytrance / Psy Chill")
- ✅ **Key**: `D Major` (from "Key: 6B – D Major")
- ✅ **Mood**: `Romantic` (from "Theme: Love as Frequency")

**If API doesn't provide these, the parsed values will be used instead of defaults!**

## Logging

All metadata extraction is logged to `callback_log.txt` showing:
- What the API returned
- What was parsed from your prompt
- What defaults were used
- Final values applied

Check the log file to see exactly what happened for each track.