ExtendMusicRequest

{
    "task_type": "extend_music",
    "clip_id": "abc123xyz789",
    "starts_at": 30,
    "length": 60,
    "instruction": "Add soaring violin strings and an uplifting orchestral build.",
    "sound": "string",
    "lyrics": "string",
    "title": "string",
    "seed": "string",
    "mv": "Lyria 3 Pro",
    "webhook_url": "http://example.com",
    "webhook_secret": "string"
}