{
  "song_id": "01_Blau (蓝)_20260420",
  "prompt": "Genre: Mandopop / Neo-Soul / R&B; BPM: 172; Key: D minor; Rhythm: Laid-back, behind-the-beat hip-hop groove. Syncopated kick, sharp rimshot on 2 & 4, swung 16th-note hi-hats.; Instruments: Clean electric bass playing melodic lines. Two electric guitars: one for jazzy chords, one lead with a warm, soulful tone playing the main hook. Subtle Rhodes pad.; Vocals: Male. Smooth, breathy tenor with frequent use of falsetto and head voice. Relaxed, conversational delivery. Processed with reverb and subtle delay.; Mood: The quiet of a city street at 3 AM, streetlights blurring through the window as you lie awake.; Production: High-fidelity, polished mix with analogue warmth. Wide stereo image, vocals centered, with airy plate reverb.; Language: Mandarin; Highlight: The main guitar hook entering for the first time after the intro, its simple bluesy melody serving as the song's central, wordless vocal theme.",
  "title": "Spare Key",
  "lyrics": "[intro]\n(Chords: Gm7 - C7 - Fmaj7 - Bbmaj7)\n(Inst: Clean jazz guitar chords, followed by laid-back drums and melodic bass. Main soulful guitar hook enters at the end.)\n(Mix: Starts narrow with guitar, opens up to full width when rhythm section enters.)\n(Sound-Design: Tape hiss and room tone.)\n\n[verse]\n(Chords: Dm7 - G7 - Cmaj7 - Fmaj7)\n(Vocal-Perf: Conversational, breathy tenor in a low-mid range. Rhythmic and syncopated phrasing.)\n(Inst: Bass and drums maintain the groove. Guitar plays subtle chordal fills.)\n(Mix: Vocals sit comfortably inside the pocket of the rhythm section.)\n(Transition: Short drum fill.)\nhey\nyour jacket's still hanging on my door\noh\nthe zipper's stuck the same way as before\nI learned to sleep on just my side\nleft the other half untried\nso tell me why I still reach over\nin the dark\n\n[chorus]\n(Chords: Dm7 - Gm7 - C7 - Fmaj7)\n(Vocal-Perf: Lead vocal becomes more melodic and sustained. Backing vocals enter with lush harmonies. Falsetto ad-libs.)\n(Inst: Soulful lead guitar hook plays underneath the vocals, acting as a counter-melody.)\n(Mix: Widest point of the song. Vocals and harmonies fill the space.)\nthere's a spare key on my shelf\nsitting silent all by itself\nevery time I pass that spot\nI feel the weight of what we lost\nspare key — still warm\nfrom the shape of your hand\n\n[interlude]\n(Chords: Dm7 - Gm7 - C7 - Fmaj7)\n(Inst: Lead guitar hook takes center stage again with a slight variation. Bass becomes more melodic.)\n(Mix: Vocals drop out, creating space for the instruments.)\n(Transition: Smooth, no abrupt changes.)\n\n[verse]\n(Chords: Dm7 - G7 - Cmaj7 - Fmaj7)\n(Vocal-Perf: Delivery similar to first verse, maintaining the relaxed feel.)\n(Inst: Instrumentation remains consistent, creating a stable backdrop for the new lyrics.)\n(Transition: A subtle reverse cymbal swell into the chorus.)\nI keep the plants you never named alive\nwater them on days I barely survive\nyour coffee mug sits in the back\nI moved it once and moved it back\nthrowing it out\nfelt like closing a door\nI wasn't ready for\n\n[chorus]\n(Chords: Dm7 - Gm7 - C7 - Fmaj7)\n(Vocal-Perf: Emotion builds slightly. More ad-libs and falsetto runs in the background.)\n(Inst: All elements present, driving the hook home.)\nthere's a spare key on my shelf\nsitting silent all by itself\nevery time I pass that spot\nI feel the weight of what we lost\nspare key — still warm\nfrom the shape of your hand\n\n[bridge]\n(Chords: Am7 - D7 - Gm7 - C7)\n(Vocal-Perf: Rhythmic, repetitive vocal phrase. Heavily layered with different harmonies and ad-libs. Main vocal is processed with more delay/reverb.)\n(Inst: Rhythm section holds the groove, guitars are more sparse, creating focus on the vocal texture.)\n(Transition: Music thins out, leading into the outro.)\nmaybe I should change the lock\nlet the seasons off the hook\nbut the ridges pressed into my palm\nread like every page I never took\nspare key\nstill here\n\n[outro]\n(Chords: Dm7 - Gm7 - C7 - Fmaj7)\n(Inst: Instruments fade out one by one, leaving the guitar hook.)\n(Vocal-Perf: Final falsetto ad-libs echo and fade with reverb and delay.)\n(Structure: Gradual fade out.)",
  "cover_prompt": "生成一张无字音乐专辑封面。风格参照日本\"もの派\"（Mono-ha）的物质感与李禹焕（Lee Ufan）绘画中\"留白与一笔\"的克制美学，结合湿拓画（Ebru / paper marbling）的有机纹理。画面核心：一把极度简化的金属钥匙轮廓，静置于大面积灰白宣纸质感的画面正中偏下，钥匙的边缘以墨水在湿润纸面上自然渗透晕开的方式呈现，颜色从深锈铁棕向烟灰蓝过渡，如同旧铜器沉积多年的包浆。背景是接近空白的淡米灰，隐约可见手工纸纤维的纹路与极细的水渍痕迹。整体构图极度克制，大面积留白，钥匙主体偏离画面中心，营造出一种被遗忘却被珍藏的静默张力。\n\n技法要求：几何图形的边缘必须是颜料在湿润纸面上自然扩散形成的（ink bleeding on wet paper），而非数字绘制的精准轮廓。背景需要呈现真实手工纸的纤维质感（visible paper fibers, deckled edges texture），可以带有轻微的水渍痕迹（watermark stains）和纸张泛黄的老化感。构图极度克制，大面积留白，主体偏离中心（off-center composition）。整体像一张被扫描的实体版画作品（scanned fine art print），而非数字生成图像。\n\n绝对禁止：任何文字/字母/拼音、人物或人物轮廓、复杂场景、风景照片感、3D渲染、塑料质感的光泽。",
  "cover": {
    "template_id": 2,
    "template_name": "几何光影艺术流",
    "scene_description": "一把极度简化的金属钥匙轮廓，静置于大面积灰白宣纸质感的画面正中偏下，钥匙的边缘以墨水在湿润纸面上自然渗透晕开的方式呈现，颜色从深锈铁棕向烟灰蓝过渡，如同旧铜器沉积多年的包浆。背景是接近空白的淡米灰，隐约可见手工纸纤维的纹路与极细的水渍痕迹。整体构图极度克制，大面积留白，钥匙主体偏离画面中心，营造出一种被遗忘却被珍藏的静默张力。"
  },
  "style_direction": "B",
  "style_reference": "Billie Eilish, Olivia Rodrigo"
}