{
  "song_id": "01_Perfect_20260412",
  "prompt": "Genre: Acoustic Pop Ballad, Singer-Songwriter, 6/8 Waltz with an infectious pop earworm sensibility; BPM: 64; Key: Ab Major; Rhythm: Slow, lilting 6/8 waltz feel with a strong pulse on beats 1 and 4, creating a simple, swaying dance groove; Instruments: Fingerpicked acoustic (audible fret buzz, body resonance), lush orchestral strings (wide stereo image), warm grand piano (soft felt hammers), clean electric bass (roundwound strings); Vocals: Male. intimate close-mic, soft breathy timbre in verses, soaring to a clear, powerful chest voice in the chorus, with minimal processing; Mood: The feeling of a slow dance in a living room late at night, socks on a wooden floor, with the only light coming from the street outside; Highlight: The moment the first chorus hits, where the sparse acoustic guitar is suddenly supported by a deep, round bass note and a single soft kick on beat one, lifting the vocal from intimate to anthemic.",
  "title": "Spare Key",
  "lyrics": "[intro]\n(Mix: High-fidelity, warm analog feel. Clean, centered acoustic guitar. Wide stereo field. Light plate reverb. Focus on pristine clarity. Gentle bus compression.)\n(Inst: Fingerpicked acoustic guitar, arpeggiated chords, audible finger slides and fret noise.)\n(Chords: Ab - Fm - Db - Eb)\n(Sound-Design: Solo acoustic guitar establishes intimate waltz feel.)\n\n[verse]\n(Mix: Vocal brought forward, extremely present and dry.)\n(Inst: Solo acoustic guitar continues, simple accompaniment.)\n(Vocal-Perf: Soft, breathy, close-mic'd delivery. Conversational tone.)\n(Melody-Contour: Mostly stepwise motion, narrow range, gentle descending phrases.)\n(Melody-Rhythm: Phrases begin on beat 1, relaxed eighth-note flow, slight push/pull against the tempo.)\n(Chords: Ab - Fm - Db - Eb)\nYour toothbrush showed up on a Thursday\nI never asked, you never said a word\nThe grocery list in your handwriting\nStill stuck beneath the magnet on the fridge\n\n[chorus]\n(Mix: Wider stereo image. Bass and kick drum add weight. Strings enter subtly.)\n(Inst: Acoustic guitar strums lightly. Deep, round sub-bass on root notes. Soft kick on beat 1. Swelling string pads.)\n(Vocal-Perf: Shifts to clearer, more supported chest voice. Dynamic lift. Subtle harmony on key phrases.)\n(Hook-DNA: Rhythmic motif: two eighths + quarter on 'broken roads'; anchors on the tonic; repeats twice before melodic variation.)\n(Melody-Contour: Arch shape, ascending leap of a major 3rd to start the main phrase, peaks on the 5th.)\n(Melody-Rhythm: Strongly on the beat, driving quarter-note feel in the melody against the 6/8 groove.)\n(Melody-Harmonic-Tension: Melody holds the 3rd over the IV chord, creating a sweet, stable consonance; resolves cleanly at the end of each phrase.)\n(Chords: Fm - Db - Ab - Eb)\nLeave your spare key on the counter tonight\nI'll keep the hallway lamp on, burning low and bright\nNo ceremony, no promise, nothing signed\nJust the sound of you breathing — that's enough to quiet my mind\nSo stay, just stay\n\n[verse]\n(Mix: Slightly more reverb on vocal, blending with new instruments.)\n(Inst: Acoustic guitar, bass, soft kick continue. Gentle piano arpeggios added. Organ pad swells.)\n(Vocal-Perf: Sustains clarity but at a lower dynamic. Builds intensity towards the end.)\n(Melody-Contour: Similar to verse 1, but with a slight lift in the upper register.)\n(Melody-Rhythm: Consistent with verse 1.)\n(Chords: Ab - Fm - Db - Eb)\nYou borrowed my old flannel shirt last winter\nNever gave it back and I never asked why\nSomehow the ordinary filled the hollow\nThat all my careful solitude had tried to hide\n\n[bridge]\n(Mix: Instruments pull back, creating space. Strings become more prominent.)\n(Inst: Piano chords are the main harmonic support. Acoustic is sparse. Strings swell dynamically.)\n(Vocal-Perf: Emotional peak. Full chest voice, sustained notes, slight vocal strain for effect.)\n(Melody-Contour: Ascending sequence, builds tension by repeating a phrase a step higher each time.)\n(Melody-Harmonic-Tension: Melody hangs on the 2nd and 4th over a sustained V chord, creating significant tension that pulls towards the final chorus resolution.)\n(Chords: Db - Ab - Eb)\nI used to keep the deadbolt turned at midnight\nUsed to let the answerphone take every call\nBut you left your laugh inside my Tuesday morning\nAnd I don't know how to lock that out at all\n\n[interlude]\n(Mix: Piano centered, with lush reverb and delay.)\n(Inst: Melodic piano solo. Full band supports: bass, drums, strings.)\n(Melody-Contour: Solo mimics vocal melody from the chorus, then elaborates with arpeggiated figures.)\n(Chords: Fm - Db - Ab - Eb)\n\n[chorus]\n(Mix: Fullest dynamic point. Drums more present. Lush vocal harmonies are prominent.)\n(Inst: Full band. Strummed acoustic, piano chords, active bassline, driving kick/snare pattern, soaring multi-layered strings.)\n(Vocal-Perf: Peak intensity. Full-throated, powerful delivery. Lush background vocal stacks.)\n(Hook-DNA: Same as first chorus, but with added layers and higher energy.)\n(Melody-Harmonic-Tension: Tension is heightened by the fuller arrangement and more powerful vocal delivery, but the core harmonic relationship remains consonant.)\n(Chords: Fm - Db - Ab - Eb)\nLeave your spare key on the counter tonight\nI'll keep the hallway lamp on, burning low and bright\nNo ceremony, no promise, nothing signed\nJust the sound of you breathing — that's enough to quiet my mind\nSo stay, just stay\n\n[outro]\n(Mix: Gradual decrescendo. Reverb tails become audible as instruments fade.)\n(Inst: Instruments strip away, leaving just piano and sustained strings.)\n(Vocal-Perf: Returns to a soft, intimate delivery. Final line is almost whispered.)\n(Chords: Fm - Db - Ab)\nYeah, just stay\nLeave your spare key\nAnd stay...",
  "cover_prompt": "生成一张极简主义的几何光影艺术图片作为无字音乐专辑封面。画面的核心是：一把轮廓边缘极度柔和、几近消融于背景中的钥匙几何剪影，处于从深琥珀棕到哑光奶油白的水彩渐变背景中，钥匙右侧透出一道细窄的暖橙色光缝，仿佛门后有人在等待。画面必须展现出微妙的高级材质肌理，特别是类似水彩晕染（Watercolor texture）或粗糙艺术纸张的触感。整体构图极度克制、留白（Minimalistic composition），注重光与影的柔和交错（Light and shadow interplay）。强烈要求：画面必须保持极致的安宁与静谧（Calm and serene），除了基础的、柔焦的简单几何图形（如模糊的圆、半透明的方块或柔和的线条）外，绝对不要出现任何复杂的现实物体、风景或人物！画面必须是无字封面，绝对不要生成任何文字、拼音或英文字母！绝对不要生成人物轮廓。传达出一种充满诗意、呼吸感与冥想空间的视觉感受。",
  "cover": {
    "template_id": 2,
    "template_name": "几何光影艺术流",
    "scene_description": "一把轮廓边缘极度柔和、几近消融于背景中的钥匙几何剪影，悬于从深琥珀棕到哑光奶油白的水彩渐变背景中，钥匙一侧透出细窄的暖橙色光缝，如同门后有人守候的温柔亮光，整体留白极致，传达出平凡日常中无声的依恋与安定感。"
  },
  "style_direction": "B",
  "style_reference": "Taylor Swift, Billie Eilish"
}