What problem does it solve? Songs often feel loose because every section sounds like new material with no audible connection to what came before. This Skill defines what each section does with the song's core motif, filling the material and form[].development fields of an ARR-SPEC so every section can state where its content comes from. ## Core Features & Use Cases - Closed set of ten development operations: repeat, sequence, extend, contract, fragment, vary, augment, counterpoint, new, and recap, each with its criterion and cost drawn from Schoenberg, Yang Ruhuai, and Li Jiti. - Motif-to-phrase-to-form reasoning: covers motive construction, phrase extension, overlap and supplement between sections, and the variation branch for chorus passes. - Pop-song landing points: default treatments for second verses, pre-choruses, bridges, final choruses, and outros, plus three whole-song warnings (e.g., no more than half the sections may be new). - Use Case: When a second verse copies the first verbatim or a bridge turns into a different song, use this Skill to decide whether the section should repeat with a new tail, fragment the motif, or introduce inherited new material, and record the choice in the spec. ## Quick Start Ask the agent to fill in the material and per-section development fields of an ARR-SPEC for your song, describing the motif and what each section does with it.
