{
  "id": "city-pop-02",
  "title": "夜色電台 (Night Radio) · 02",
  "genre": "city-pop",
  "genre_label": "City Pop",
  "cohort": "controlled",
  "collection_selected": false,
  "variant": "baseline",
  "composition_number": 1,
  "request": {
    "id": "city-pop-02",
    "text": "Instrumental city pop, retro 1980s disco funk, electric piano, synth bass, shimmering clean electric guitar, drums, upbeat summer night drive, 104 BPM, no vocals, no singing. A compact 60 second original instrumental cue, gentle introduction, a coherent middle, and a naturally resolved quiet ending.",
    "lyrics": "[Instrumental]",
    "duration_sec": 60,
    "num_inference_steps": 30,
    "seed": 20260921,
    "guidance_scale": 1.7,
    "ar_guidance_scale": 1.5,
    "top_k": 50
  }
}