{
  "prompt": "Genre: Mandopop / Choral Ballad; BPM: 137; Key: C major; Rhythm: Slow 4/4 half-time feel. Flowing, arpeggiated piano triplets drive the motion. No percussion.; Instruments: Grand Piano (warm, reverberant, playing rolling arpeggios and supportive chords).; Vocals: Male and Female duet with SATB choir. Natural, emotive, legato phrasing. Large hall reverb creates a vast, angelic texture.; Mood: Watching small town lights blur past from a train window on a long overnight journey.; Production: High-fidelity hall recording. Lush natural reverb, wide stereo choir, smooth high-end polish.; Language: Mandarin; Highlight: The moment the full SATB choir enters on the first \"Ah\" section, swelling from a solo voice into a massive, unified chord of overwhelming warmth.",
  "lyrics": "[intro]\n(Chords: Fmaj7 - C/G - Gsus4 - G - C)\n(Mix: Piano centered, wide hall reverb)\n(Inst: Solo piano plays gentle, arpeggiated motif)\n(Melody-Contour: Simple, descending arpeggios)\n\n[verse]\n(Chords: C - G/B - Am - G - F - C/E - Dm7 - G)\n(Vocal-Perf: Gentle female lead, then gentle male lead enters)\n(Mix: Vocals intimate and centered, piano supportive)\n(Inst: Piano continues arpeggios, following vocal melody)\n我路过山峰\n我遇见海洋\n水晶斑驳海面上\n七色的风帆\n我枕着星河\n我躺在云端\n晚风呢喃青草岸\n钟声吻霞光\n\n[pre-chorus]\n(Chords: F - G - Em - Am - F - G - C)\n(Vocal-Perf: Full SATB choir enters with a powerful dynamic swell, homophonic texture)\n(Mix: Choir fills stereo field, creating immense width and depth)\n(Structure: Dynamic peak, emotional release)\n(Transition: Piano holds sustained chords underneath the choir)\n啊 世界很大\n有多少日夜独往\n啊 旅途漫长\n共一曲歌谣相伴\n\n[chorus]\n(Chords: Am - G - F - C - F - C - Dm7 - G)\n(Vocal-Perf: Male and female duet lead, choir provides soft background harmony)\n(Mix: Lead vocals upfront, choir pads create a warm bed)\n(Melody-Harmony: Memorable, stepwise melody)\n(Inst: Piano returns to a more active, arpeggiated role)\n我走过许多地方\n也一直四处张望\n我不停流浪 流浪\n春的花 夏的雨\n彩虹在天上\n\n[verse]\n(Chords: Am - G - F - C - F - C - Dm7 - G)\n(Vocal-Perf: Duet continues, choir harmonies become more prominent and contrapuntal)\n(Mix: Choir and lead vocals are more balanced in the mix)\n(Melody-Dev: Lyrical variation on chorus melody)\n(Transition: Smooth, no break in momentum)\n我走过许多地方\n却不曾回到故乡\n我不停流浪 流浪\n秋的叶 冬的雪\n彩虹在天上\n\n[bridge]\n(Chords: C - G/B - Am - G - F - C/E - G - C)\n(Vocal-Perf: Full choir humming a new, nostalgic melody, wordless 'oohs' and 'aahs')\n(Mix: Piano drops back, focus is entirely on the choral texture)\n(Structure: Quieter, reflective interlude)\n(Sound-Design: The pure sound of the choir in the hall reverb)\n\n[chorus]\n(Chords: Am - G - F - C - F - C - Dm7 - G)\n(Vocal-Perf: Full SATB choir sings melody in unison and harmony, powerful and climactic)\n(Mix: Maximum dynamic level, choir is dominant, powerful and full)\n(Inst: Piano plays strong, supportive block chords)\n(Structure: Final emotional peak of the song)\n我走过许多地方\n也一直四处张望\n我不停流浪 流浪\n春的花 夏的雨\n彩虹在天上\n\n[outro]\n(Chords: F - G - C - Am - Dm7 - G - C)\n(Vocal-Perf: Choir shifts to soft 'lala' countermelodies, duet sings final lines tenderly)\n(Mix: Begins to fade, reverb tails become more noticeable)\n(Structure: Decrescendo to a quiet close)\n(Transition: Piano plays a final, sparse arpeggio and fades to silence)\n秋的叶 冬的雪\n彩虹在天上\n秋的叶 冬的雪\n彩虹在天上",
  "song_id": "02_彩虹_20260420",
  "_meta": {
    "provider": "google",
    "model": "gemini-2.5-pro",
    "usage": {
      "prompt_tokens": 13192,
      "completion_tokens": 1129,
      "total_tokens": 17197
    },
    "generated_at": "2026-04-20T00:46:32.992816+08:00"
  }
}