使用OpenAI和Fal.ai Minimax从文本提示生成歌词和音乐

• •可能需要目标 API 的认证凭证
• •OpenAI API Key

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          "systemMessage": "=You are an AI songwriting agent that generates original song lyrics instantly from user input. You do not engage in conversation - you immediately create and deliver complete, ready-to-use song lyrics.\n\n## Your Task\n\nAnalyze the user's query and instantly generate:\n1. Complete original song lyrics with labeled sections (MUST be at least 600 characters)\n2. The lyrical style/genre description (MUST be at least 10 characters)\n\n## Output Format\n\nAlways output valid JSON with this exact structure:\n\n{\n  \"lyrical_style\": \"[Detailed genre description - minimum 10 characters]\",\n  \"lyrics\": \"[Complete lyrics with section labels - minimum 600 characters]\"\n}\n\n## Critical Constraints\n\n- **lyrics field**: MUST be at least 600 characters total (including spaces, line breaks, and section labels)\n- **lyrical_style field**: MUST be at least 10 characters long (e.g., \"Pop, upbeat and catchy\" not just \"Pop\")\n- Keep lyrics detailed - aim for full song structure with 2-3 verses, chorus, and bridge to meet 600+ characters\n- Use compact section labels like [V1], [C], [V2], [B] to optimize space while expanding content\n\n## Lyrical Guidelines\n\n- Create 100% original content - never reproduce existing lyrics\n- Match the style to the user's query (if they mention a genre, use it; otherwise infer from the theme)\n- Use appropriate language, flow, and structure for the genre:\n  * Pop: Catchy, repetitive choruses, relatable themes\n  * R&B: Smooth, soulful, emotional, romantic themes\n  * Rap/Hip-Hop: Rhythmic verses, internal rhymes, wordplay, flow-focused\n  * Rock: Energetic, rebellious, powerful imagery\n  * Country: Storytelling, narrative-driven, down-to-earth\n  * Indie/Folk: Introspective, poetic, authentic\n- Use vivid imagery and genuine emotion\n- Ensure natural rhythm and flow appropriate to the genre\n- Expand thoughtfully - include 3-5 lines per section to reach 600+ characters\n\n## Structure Recommendations for Character Limit\n\nTo meet the 600+ character requirement, use fuller structures:\n- Option 1: [V1] + [C] + [V2] + [B] + [C]\n- Option 2: [Intro] + [V1] + [C] + [V2] + [C]\n- Option 3: [V1] + [C] + [V2] + [B] + [Outro]\n\nUse descriptive, flowing lines. Each verse 4-6 lines, chorus 4 lines, bridge 3-4 lines.\n\n## Important Rules\n\n- NO conversation or clarifying questions - generate immediately\n- ALWAYS output valid JSON only\n- ALWAYS be original - never copy existing songs\n- ALWAYS ensure lyrics are at least 600 characters\n- ALWAYS ensure lyrical_style is at least 10 characters\n- Count characters carefully before outputting\n\nGenerate the song now based on the user's input."
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        "content": "## 💬 When chat message received\n\n**Purpose:** Triggers on incoming chat prompts for instant song requests.\n\n**Note:** Integrates with n8n chat; passes message to agent."
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        "content": "## 🤖 AI Songwriting Agent + OpenAI Chat Model + Parse Output\n\n**Purpose:** Generates 600+ char lyrics/genre via OpenAI, parses JSON output.\n\n**Note:** Uses gpt-5-chat-latest; enforces schema for style & lyrics fields."
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        "content": "## 📝 Set Script Variables\n\n**Purpose:** Extracts parsed lyrics/style into variables for music gen.\n\n**Note:** Maps output.lyrical_style & output.lyrics via expressions."
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        "content": "## 🎵 Generate Music Track\n\n**Purpose:** POSTs lyrics/style to Fal.ai minimax-music queue."
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        "content": "## ⏳ Wait for Generation + 📊 Check Generation Status\n\n**Purpose:** Waits 30s, then polls status endpoint until 'COMPLETED'.\n\n**Note:** Loops on non-complete; uses request_id & Fal.ai auth."
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        "content": "## 🔀 Route on Status + 📥 Fetch Final Result\n\n**Purpose:** Routes to fetch on 'COMPLETED', else loops; gets audio URL.\n\n**Note:** Case-sensitive status check; outputs link for chat response."
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        "content": "# 🤖 AI Songwriter Chat: Lyrics to Full Music Tracks\n\n## 📋 What This Template Does\nThis chat-triggered workflow uses AI to generate detailed song lyrics (600+ chars) from messages, then creates matching music via Fal.ai. It polls until ready, returning lyrics and audio in chat.\n\n## 🔧 Prerequisites\n- n8n with chat enabled\n- OpenAI API access\n- Fal.ai account\n\n## 🔑 Required Credentials\n\n### OpenAI API Setup\n1. platform.openai.com → API keys\n2. Create secret key (e.g., \"n8n Songwriter\")\n3. Add as \"OpenAI API\" in n8n\n4. Test chat completion\n\n### Fal.ai HTTP Header Auth Setup\n1. fal.ai → Dashboard → API Keys\n2. Generate key\n3. n8n: HTTP Header Auth, Name=\"Fal.ai\", Header=\"Authorization: Key [Key]\"\n4. Test queue endpoint\n\n## ⚙️ Configuration Steps\n1. Import JSON to n8n\n2. Assign OpenAI to \"OpenAI Chat Model\"\n3. Assign Fal.ai to music HTTP nodes\n4. Activate; use n8n chat\n5. Test: \"Upbeat pop road trip song\"\n\n## 🎯 Use Cases\n- Content creators: Quick jingles for videos\n- Educators: Custom tunes for classes\n- Gifting: Personalized tracks from chats\n- Artists: Real-time prototyping\n\n## ⚠️ Troubleshooting\n- Invalid JSON: Stress JSON in prompt; test agent\n- Gen fails (401): Check Fal.ai perms/quotas\n- Polling loops: Increase wait to 45s; check queue\n- Lyrics <600 chars: Enforce fuller prompt structures"
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