What problem does it solve? Deciding which instrument should play which line is a core arranging problem: the wrong choice makes woodwinds vanish, MIDI mockups sound fake, and mixed timbres turn muddy. This Skill provides decision-level orchestration rules distilled from classic treatises (Yang Liqing, Adler, Pejrolo & DeRosa, Yang Chunlin) so every instrument choice is justified rather than guessed. ## Core Features & Use Cases - Timbre Decision Framework: Choose between pure and mixed timbres, then apply unison doubling, octave coupling, or cross-register coloring, with checks for the counterintuitive neutralization effect where stacked woodwinds cancel each other out. - Balance and Register Rules: Balance by actual player count and register-dependent loudness, exploit register-as-character (e.g., violin sul G vs sul E), and apply the three conditions for making a section cut through the texture. - MIDI and Chinese Folk Orchestra Scoring: Adapt acoustic orchestration logic to sampled instruments, and score for the four Chinese folk sections (winds, plucked strings, bowed strings, percussion) with octave-notation tables, section pairing rules, and full-ensemble assignment templates. - Use Case: When filling the roster fields of an ARR-SPEC arrangement document, use this Skill to decide that a melody goes to oboe doubled an octave below by clarinet, verify the balance by headcount, and confirm each instrument sits in a strong register. ## Quick Start Ask the agent to orchestrate a melody and chord progression for a specific ensemble, for example by requesting which instruments should carry the melody, bass, and harmony in a Chinese folk orchestra arrangement.
