music-generator（音乐发生器）

Music Generator

First time? If setup_complete: false above, run ./SETUP.md first, then set setup_complete: true.

Generate custom AI music using ElevenLabs Music API with detailed composition control.

Features

• Simple Mode: Generate music from a text prompt
• Detailed Mode: Create multi-section compositions with precise control over styles, moods, and transitions
• Instrumental or Vocal: Support for both instrumental and vocal tracks
• Custom Duration: Generate tracks from 15 seconds to 5 minutes

Quick Start

cd ~/.claude/skills/music-generator/scripts

# Simple prompt-based generation
npx ts-node generate_music.ts \
  --prompt "Uplifting corporate music with electronic beats" \
  --duration 60 \
  --output /path/to/music.mp3

# List available styles
npx ts-node generate_music.ts --list-styles

Composition Modes

1. Simple Mode (--prompt)

Generate music from a single text prompt:

npx ts-node generate_music.ts \
  --prompt "Energetic workout music with driving beats and motivational synths" \
  --duration 90 \
  --output workout.mp3

2. Detailed Mode (--composition)

Create multi-section compositions with JSON config:

npx ts-node generate_music.ts \
  --composition /path/to/composition.json \
  --output epic-track.mp3

Composition JSON Format:

{
  "duration_ms": 80000,
  "instrumental": true,
  "positive_global_styles": ["corporate", "motivational", "electronic"],
  "negative_global_styles": ["sad", "aggressive", "heavy metal"],
  "sections": [
    {
      "section_name": "Intro",
      "duration_ms": 20000,
      "positive_local_styles": ["building momentum", "soft start"],
      "negative_local_styles": ["loud", "intense"],
      "lines": []
    },
    {
      "section_name": "Main Theme",
      "duration_ms": 40000,
      "positive_local_styles": ["energetic", "uplifting", "driving rhythm"],
      "negative_local_styles": ["slow", "mellow"],
      "lines": []
    },
    {
      "section_name": "Outro",
      "duration_ms": 20000,
      "positive_local_styles": ["triumphant", "resolution"],
      "negative_local_styles": ["abrupt ending"],
      "lines": []
    }
  ]
}

Style Guide

Positive Global Styles (Overall Track Feel)

Moods:

• uplifting, inspiring, motivational, peaceful, energetic
• dramatic, epic, emotional, nostalgic, mysterious
• playful, cheerful, romantic, melancholic

Genres:

• corporate, cinematic, electronic, ambient, orchestral
• pop, rock, jazz, classical, world music
• lo-fi, hip-hop, EDM, acoustic, folk

Instruments:

• piano, guitar, strings, synths, drums
• brass, woodwinds, percussion, bass

Negative Global Styles (What to Avoid)

• aggressive, dark, scary, chaotic
• heavy metal, death metal, harsh noise
• explicit, profane

Section-Specific Styles

Use positive_local_styles and negative_local_styles to control individual sections:

Intro Styles:

• soft opening, building momentum, atmospheric
• gentle start, mysterious intro

Peak/Chorus Styles:

• energetic peak, driving rhythm, powerful
• emotional climax, triumphant

Outro Styles:

• gentle fade, triumphant ending, resolution
• nostalgic close, hopeful conclusion

Command Options

Examples

Corporate Background Music

npx ts-node generate_music.ts \
  -p "Professional corporate background music, uplifting and modern, suitable for presentations" \
  -d 120 \
  -i \
  -o corporate-bg.mp3

Podcast Intro

npx ts-node generate_music.ts \
  -p "Catchy podcast intro music, energetic and memorable, with electronic elements" \
  -d 15 \
  -o podcast-intro.mp3

Video Game Theme

npx ts-node generate_music.ts \
  -p "Epic fantasy adventure theme with orchestral instruments and heroic melodies" \
  -d 180 \
  -i \
  -o game-theme.mp3

Multi-Section Composition

Create a file my-composition.json:

{
  "duration_ms": 120000,
  "instrumental": true,
  "positive_global_styles": ["cinematic", "epic", "orchestral"],
  "negative_global_styles": ["electronic", "modern"],
  "sections": [
    {
      "section_name": "Dawn",
      "duration_ms": 30000,
      "positive_local_styles": ["soft", "mysterious", "building anticipation"],
      "negative_local_styles": ["loud", "fast"],
      "lines": []
    },
    {
      "section_name": "Battle",
      "duration_ms": 50000,
      "positive_local_styles": ["intense", "driving", "heroic"],
      "negative_local_styles": ["peaceful", "slow"],
      "lines": []
    },
    {
      "section_name": "Victory",
      "duration_ms": 40000,
      "positive_local_styles": ["triumphant", "emotional", "uplifting"],
      "negative_local_styles": ["sad", "mellow"],
      "lines": []
    }
  ]
}

Then generate:

npx ts-node generate_music.ts \
  -c my-composition.json \
  -o epic-journey.mp3

API Limits

• Maximum duration: 330 seconds (5.5 minutes)
• Minimum duration: 15 seconds
• Generation time: ~30-60 seconds per track
• Cost: ~$0.05-0.15 per generation (varies by duration)

Troubleshooting

"Invalid API key": Check .env file has valid ELEVENLABS_API_KEY

"Duration too long": Maximum is 330 seconds (5.5 minutes)

"Validation error": Ensure composition JSON has all required fields:

• positive_global_styles (array)
• negative_global_styles (array)
• sections with section_name, duration_ms, positive_local_styles, negative_local_styles, lines