- 24,810 grayscale system-segmented images:
- 14,000 samples from Sonatinas by various composers.
- 10,810 samples from compositions by Franz Liszt.
- Manual filtering of incomplete or low-quality segmentations.
- Normalization of image sizes to 128 × 512 for all samples.
- Accompanying metadata: title, composer, key (if available), IMSLP page, system index (work page, system number within page).