| # Additional benchmark details |
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| ## Selection and fixed windows |
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| The existing selection pipeline retained 106 candidate scores satisfying: |
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| - A single piano part (`keyboard.piano*`), at least 16 measures, no lyrics. |
| - The upstream best-unique-arrangement filter. |
| - Rating >= 4.5 with at least 3 ratings. |
| - The upstream 4/4 filter; the final MIDI window is checked explicitly against |
| the continuation protocol. |
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| Manual listening rejected six clear quality-control failures; their CIDs are |
| preserved in `summary.json`. The remaining 100 pieces span 15 genre labels. |
| These genres are not equally represented; see the summary for exact counts. |
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| The deterministic window builder accounts for score pickup information, |
| merges piano events and duplicate `(start, pitch)` notes, and chooses the first |
| complete protocol-compatible 16-bar window. **99 pieces use the opening window; |
| one uses the first subsequent compatible window** because the opening does not |
| meet the protocol. `challenge_test/manifest.json` records the source SHA256, |
| window index, pickup, selection reason, note counts, and MIDI parsing diagnostics. |
| No new selection or window extraction was performed for this release. |
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| ## Format |
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| Times use a sixteenth-note grid. A complete window ends at step 272, with steps |
| 0--15 reserved for an optional pickup. The four regular prompt bars occupy |
| steps 16--79. Prompt notes have start in 0--79, and reference notes in 80--271. |
| Pitch is an integer in 0--127; duration is a positive integer and notes do not |
| extend beyond step 272. Notes are sorted by `(start, pitch)`. |
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| ```json |
| {"prompt": [{"start": 16, "pitch": 60, "duration": 4}]} |
| ``` |
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| ```json |
| {"generation": [{"start": 80, "pitch": 64, "duration": 4}]} |
| ``` |
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| The fixed-window MIDIs use 480 ticks per quarter note, 120 BPM, program 0 and |
| velocity 64 for comparable listening. Original complete-piece assets retain |
| their original contents. Genre labels and source previews are auxiliary; |
| they are not additional generation conditions in the DAMN benchmark. |
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| ## Provenance, permissions and limitations |
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| Metadata records 99 source scores as `cc-zero` and one as `publicdomain`. |
| These are upstream declarations, not an independent verification of rights to |
| every underlying composition or arrangement. Existing score credits and copyright |
| notices are retained, and the explicit conflicting entry is included with its original rights notice unchanged. There is |
| no blanket license replacing source rights; see [LICENSE.md](LICENSE.md). |
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| The benchmark contains familiar repertoire and a small, curated selection of |
| genres. Source metadata can be imperfect. References are one possible |
| continuation rather than the only musically valid answer. Similarity to a |
| reference is a development proxy, not a substitute for listening evaluation. |
| The DAMN pipeline excludes benchmark matches from its training data; this does |
| not establish the absence of overlap with other models' training corpora. |
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