ReplaceMusicRequest

{
    "task_type": "replace_music",
    "clip_id": "abc123xyz789",
    "starts_at": 30,
    "ends_at": 45,
    "instruction": "Replace this segment with a heavy distorted guitar riff over double-bass drums.",
    "sound": "string",
    "lyrics": "string",
    "title": "string",
    "seed": "string",
    "mv": "Lyria 3 Pro",
    "webhook_url": "http://example.com",
    "webhook_secret": "string"
}