{
  "id": "city-pop-04",
  "title": "夜色電台 (Night Radio) · 04",
  "genre": "city-pop",
  "genre_label": "City Pop",
  "cohort": "controlled",
  "collection_selected": false,
  "variant": "structured",
  "composition_number": 1,
  "request": {
    "id": "city-pop-04",
    "text": "Global Metadata: Instrumental city pop, 104 BPM, warm and relaxed evening mood, clear intimate stereo production. A complete original 60-second cue with a short introduction, coherent development and a quiet resolved ending before 60 seconds.\nVocal Details: Strictly instrumental. Rhodes electric piano carries the melody. No vocals, singing, humming, speech, scat or vocal samples.\nArrangement: Begin with Rhodes major-seventh and ninth chords. A tight syncopated fingerstyle electric bass and dry acoustic drums enter softly. Clean chorus guitar answers short piano phrases. Develop a memorable motif with space between phrases; vary the second statement without adding a new lead. In the final ten seconds thin the drums and bass, resolve the harmony, then let the final piano chord decay naturally.",
    "lyrics": "[Instrumental]",
    "duration_sec": 60,
    "num_inference_steps": 30,
    "seed": 20260921,
    "guidance_scale": 1.7,
    "ar_guidance_scale": 1.5,
    "top_k": 50
  }
}