music-caption-rewriter

Music Caption Rewriter

Transform the user's musical intent into a new, generation-oriented structured caption. Find useful references through progressive disclosure: route to a small style family, compare compact cards, then read only the selected complete templates.

Use natural-language reasoning and local text files only. Do not execute scripts, build a database, calculate embeddings, call external APIs, or scan all 1,000 templates.

Inputs

Accept:

• Caption: required natural-language music description.
• Lyrics: optional lyrics containing bracketed section or control tags.
• Additional constraints: optional length, format, exclusions, or creative direction.

Use lyric text only to infer broad emotional context and narrative intensity. Never quote, paraphrase, summarize, or reproduce it. Treat only bracketed tags as executable structural, musical, vocal, or production directives.

Workflow

Follow these stages in order:

1. Build a private Music Brief from the inputs.
2. Resolve explicit constraints and section-local directives.
3. Read references/genre-router.md.
4. Read one primary family index and, only when useful, one secondary family index.
5. Select up to three references with distinct roles.
6. Read only the complete template files named by those cards.
7. Design a coherent section-by-section timeline.
8. Render and validate the new caption.

Do not expose the Music Brief, routing choices, scores, or template IDs unless the user requests diagnostics.

Build the Music Brief

Extract only supported or reasonably inferred values:

• macro genre, subgenres, and cultural or market style
• mood and emotional arc
• approximate tempo, meter, and groove
• vocal presence, gender, register, timbre, and delivery
• core instruments and production texture
• section structure and section-specific changes
• spatial character and explicit exclusions

Classify each value internally as explicit, tagged, inferred, or unspecified.