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arXiv · 2609.03584

Local chord corruption is not recognizer replay: structure-matched calibration

Weiwen Huang·Yunda Chen·Wangzheng Wu·Nengheng Zheng
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Abstract

Synthetic chord substitutions offer controlled tests of music generation, but their effects can differ from those of a complete recognized chord sequence. We propose structure-matched calibration, which constructs synthetic chord sequences that match the changed positions and harmonic-relation composition of recognizer replay. Paired generation compares both target-response magnitude and output-chord agreement with replay. On 29 of 30 MUSDB18-HQ songs, central four-second tritone corruption produces a larger target response than complete replay in MIDI-SAG. On 24 held-out MoisesDB songs, structure matching reduces target-response distance to replay by 81% for MIDI-SAG and 77% for MusicGen-Chord. Distance decreases on every song in both models with CNN--CRF. Joint matching also reduces output-chord mismatch with replay by 8--17 percentage points relative to temporal or relational matching alone.

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Weiwen Huang, Yunda Chen, Wangzheng Wu, Nengheng Zheng. 2026-09-13. Local chord corruption is not recognizer replay: structure-matched calibration. https://arxiv.org/abs/2609.03584

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