Key Tune Checker

The tool provides an objective assessment of whether a musical piece aligns with a specified target key and tuning standard. It serves musicians, producers, and educators who need to verify key integrity during composition, arrangement, rehearsal, or grading. By feeding the piece key and the target key, users obtain a compact readiness indicator that guides harmonization decisions and educational feedback.
Conceptually, the tool maps notes to pitch classes, compares the piece key against the target key, and computes a key match score based on scale congruence and mode alignment. If an audio or score input is supplied, it performs a spectral analysis to estimate dominant pitches and compute tuning deviation in cents relative to 12-TET. Outputs include a numeric score and optional tuning deviation that informs modulation choices and retuning needs.
Its value lies in combining key compatibility with tuning precision and providing actionable guidance in studio and classroom contexts. Core features include input validation for keys and modes, a numeric match score, optional audio analysis, and structured outputs suitable for annotations, charts, or batch processing. Use cases span song key verification, arrangement planning, rehearsal prep, and educational exercises that teach key relationships and tuning concepts.