{
  "prompt": "Genre: Jazzy Lo-fi Hip Hop / Chillhop; BPM: 80; Key: A minor; Rhythm: Relaxed, unquantized boom-bap groove with a soft kick and vinyl-crackle snare on 2 & 4; driving pocket syncopation from the swung 16th-note hi-hats.; Instruments: Upright piano, audible pedal noise; Sampled drum kit, vinyl texture; Sub-bass synth, round sine; Warm string pad, low in mix.; Vocals: No Vocals (Instrumental); Mood: Sitting by a window on a rainy afternoon, watching droplets race down the glass, a warm mug of tea steaming in your hands.; Production: High-Fidelity, Pristine Radio-Ready Mix with expensive analogue warmth and silky smooth high-end; heavy vinyl crackle, tape saturation, gentle sidechain compression from the kick, and an intimate mono-centric stereo field.; Highlight: The single, slightly sharp grace note on the piano hitting just before the downbeat of a new phrase, creating a fleeting, poignant dissonance against the warm pad.",
  "lyrics": "[intro]\n(Mix: Prominent warm low-mids, rolled-off silky highs. Heavy vinyl crackle and tape hiss establishing texture. Narrow, intimate stereo field. Gentle sidechain compression keyed to kick.)\n(Inst: Upright piano, close-mic'd, audible hammer action, introducing main theme.)\n(Chords: Am7 - Dm7 - G7 - Cmaj7)\n(Melody-Contour: Descending arpeggio with a concluding minor 3rd leap upwards.)\n(Melody-Rhythm: Main phrases land on beat 3, creating a relaxed, laid-back feel.)\n\n[verse]\n(Inst: Lo-fi drum loop enters, soft kick, textured snare. Round sub-bass enters, locking with kick.)\n(Vocal-Perf: Lead piano plays with gentle velocity, phrasing slightly behind the beat.)\n(Chords: Am7 - Dm7 - G7 - Cmaj7)\n\n[chorus]\n(Inst: Mellow string pad enters, providing a warm harmonic bed.)\n(Vocal-Perf: Piano melody shifts to a higher register, increased dynamic range.)\n(Chords: Fmaj7 - G6 - Em7 - Am7)\n(Hook-DNA: Dotted-eighth + sixteenth note piano motif on beat 1; circles the 5th (E); repeats twice, third statement rises a step to F.)\n(Melody-Contour: Gentle arch shape, featuring an ascending perfect 5th leap that defines the hook.)\n(Melody-Rhythm: Core motif is syncopated against the straight groove, creating forward momentum.)\n(Melody-Harmonic-Tension: Melody holds the major 7th over the G6 chord for a full beat before resolving down, creating a moment of sweet tension.)\n\n[interlude]\n(Inst: Drums and bass drop out. Piano is filtered, leaving only the midrange frequencies. String pad swells slightly.)\n(Vocal-Perf: Piano melody becomes sparse, more improvisational with spacious phrasing.)\n(Chords: Fmaj7 - G6)\n\n[verse]\n(Transition: Clean drum fill brings full groove back in.)\n(Inst: Full rhythm section re-enters with main piano theme.)\n(Vocal-Perf: Lead piano returns to the gentle, behind-the-beat performance of the first verse.)\n(Chords: Am7 - Dm7 - G7 - Cmaj7)\n\n[chorus]\n(Mix: Stereo image widens subtly by 10%.)\n(Inst: String pad is slightly more prominent in the mix.)\n(Vocal-Perf: Piano melody repeats the dynamic, high-register performance.)\n(Chords: Fmaj7 - G6 - Em7 - Am7)\n(Hook-DNA: Dotted-eighth + sixteenth note piano motif on beat 1; circles the 5th (E); repeats twice, third statement rises a step to F.)\n(Melody-Harmonic-Tension: Melody again holds the major 7th over the G6 chord, reinforcing the section's emotional core.)\n\n[outro]\n(Inst: Drums and bass fade out over four bars. Piano plays a final, unresolved melodic fragment.)\n(Vocal-Perf: Piano plays final phrase with heavy ritardando.)\n(Chords: Am7)\n(Sound-Design: Music fades completely, leaving only the sound of vinyl crackle and a soft tape hiss for two seconds.)\n",
  "song_id": "04_nostalgia_20260514",
  "_meta": {
    "provider": "google",
    "model": "gemini-2.5-pro",
    "usage": {
      "prompt_tokens": 7023,
      "completion_tokens": 1052,
      "total_tokens": 11362
    },
    "generated_at": "2026-05-14T12:07:34.255199+08:00"
  },
  "_prompt_compressed": {
    "from": 1030,
    "to": 934
  }
}