Dataset Card for jam-actions-v0 (public subset)

Version: 0.6.0 — a correction release. It withdraws 58 records whose source arrangements could not be licence-cleared and changes no remaining record. See Version 0.6.0 correction.

Records built: 2026-07-11 (0.5.0 cut; unchanged) Package built: 2026-09-25

DOI: 10.5281/zenodo.22961580 (this version; concept DOI 10.5281/zenodo.22961579). Earlier versions: 0.5.0 10.5281/zenodo.21313954 and 0.4.3 10.5281/zenodo.20279919. Both contain the withdrawn records — cite 0.6.0 for new work. The concept DOI 10.5281/zenodo.20279918 also holds versions of the separate jam-actions-v1 dataset and currently resolves to them, so cite a version DOI rather than that concept DOI.

Version 0.6.0 correction

Versions 0.4.x and 0.5.x contained 115 records across 8 compositions, all attributed to Bernd Krueger / piano-midi.de under CC-BY-SA-3.0-DE. That attribution was verified at the level of piano-midi.de's composer pages. In September 2026 the source repository audited its song library from the MIDI bytes themselves and found that four of those songs had been built from files obtained elsewhere:

Song	Records withdrawn	Where the file actually came from
chopin-nocturne-op9-no2	18	midiworld.com, no arrangement credit or licence
chopin-prelude-e-minor	12	bitmidi.com, no arrangement credit or licence
pathetique-mvt2	16	midiworld.com, no arrangement credit or licence
schumann-traumerei	12	midiworld.com, no arrangement licence

The compositions are public domain, but the arrangements in those files are not licence-cleared, and the records carry them note for note (MIDI events with performance timing and dynamics, REMI and ABC tokens, and piano-roll SVGs). They were therefore withdrawn. Do not redistribute those records from versions 0.4.x or 0.5.x.

What changed in 0.6.0, and what did not:

• 57 records remain: the Bach, Mozart, Beethoven (Für Elise) and Debussy (Clair de Lune) arrangements by Bernd Krueger. Every remaining record is byte-identical to 0.5.0.
• The historical eval artifacts are no longer shipped. They were measured on the 115-record composition, several embed withdrawn records, and they remain available in the source repository's history for reproducibility of past claims. The package carries one receipt for this version: evals/v0.6.0-execution-verification.json, in which every unique frozen tool call in the 57 records (114) replayed against the live MCP server with 0 failures.
• The packager now refuses to ship any record that its song's library provenance does not clear, or whose source file hash differs from the evidenced file. A provenance change halts packaging.
• The fine-tuned adapters trained on the 0.5.x records have been withdrawn, because their training data included the withdrawn records.

The full audit is docs/findings/published-dataset-licence-audit.md in the source repository.

Dataset Summary

jam-actions-v0 is a corpus of multi-turn MCP (Model Context Protocol) tool-use traces grounded in real classical-piano MIDI. Each record pairs a short phrase window (typically 4 measures) with an annotated teaching target and a target trace — a turn-by-turn session in which an assistant uses the ai-jam-sessions MCP tools to read, analyze, and discuss the phrase. The dataset teaches LLMs to do grounded tool-use over symbolic music, not just text generation.

This is the public subset: 57 records across 4 compositions, all under CC-BY-SA-3.0 (DE jurisdiction). Songs from the full source corpus that are not included are listed under Limitations.

Dataset Structure

Top-level files:

• records.jsonl — one JSON object per line; the canonical training feed. Each line is a complete record with an additional split field ("train" or "test") so consumers can use the file without consulting splits.json.
• records/ — the same records as individual JSON files (sorted by id), useful for spot-inspection or downstream tools that prefer one-record-per-file.
• pianoroll/ — one SVG per record, matched by basename (<id>.svg corresponds to records/<id>.json).
• evals/v0.6.0-execution-verification.json — the standing execution gate for this version: 114 unique frozen tool calls replayed against the live MCP server, 0 failures.
• splits.json — train/test split with held_out_song pinned. Locked: clair-de-lune is the canonical held-out test set; it is NEVER used for training.
• provenance-verification.json — per-song URL verification report from Slice 2.5 (filtered to the public songs).
• manifest.json — package-scope manifest with record_count, pair_count, songs_included, splits, etc.
• CITATION.cff — Citation File Format metadata.
• LICENSE-DATASET.md — layered-licensing explainer (public-domain compositions + CC-BY-SA-3.0-DE arrangements).
• ATTRIBUTION.md — per-layer attribution facts and copy-pasteable credit strings.
• KNOWN_LIMITATIONS.md, DATASET_SCHEMA.md, RELEASE_NOTES.md — scope, schema and version history.
• VERSION — single-line package version.
• checksums.sha256 — SHA-256 sums of every other file in the package, sorted by path.
• package-inputs.json — packager-internal contract declaring which files are curated (preserved byte-for-byte) vs generated (rebuilt by scripts/package-jam-actions-public.ts on every run). Not consumed by downstream users; included for packager reproducibility.

Each record has these top-level fields: id, schema_version, provenance, scope, observation, annotation_target, target_trace, eval_metadata. See the source repo's src/dataset/schema.ts for the full Zod schema.

What's in a record

One line of records.jsonl is one phrase-window record. Abbreviated below (Clair de Lune, the held-out test song; … marks omitted prose/notes):

{
  "id": "clair-de-lune:m001-004:piano:mcp-session:v1",
  "split": "test",
  "scope": { "song_id": "clair-de-lune", "phrase_window": "measures 1-4", "key": "Db major",
             "tempo_bpm": 100, "time_signature": "9/8",
             "musical_phrase_label": "opening atmosphere — introductory phrase" },
  "provenance": { "composer": "Claude Debussy", "arrangement_creator": "Bernd Krueger",
                  "arrangement_license": "CC-BY-SA 3.0", "record_verdict": "public",
                  "training_use_permitted": true /* + source URL, PD status, verifier, verified_at */ },
  "observation": {
    "midi_sidecar": { "ticks_per_beat": 480, "timed_events": [
      { "t_seconds": 0.3, "dur_seconds": 2.4, "note": 65, "name": "F4",
        "velocity": 36, "hand": "right", "measure": 1, "beat": 0.5 } /* … one per note … */ ] },
    "tokens_remi": "…", "tokens_abc": "…", "piano_roll_svg_inline": "<svg…>"
  },
  "annotation_target": {
    "structure": "Opening atmospheric introduction — 9/8 ripple, floating long melody notes",
    "key_moments": ["m1 opening chord with sustained melody", "…"],
    "teaching_goals": ["9/8 triplet pulse must feel like three big beats, not nine", "…"],
    "style_tips": ["…"], "teaching_notes": [{ "measure": 1, "note": "…", "technique": ["…"] }]
  },
  "target_trace": {
    "task_family": "analyze-and-play-phrase",
    "objective": "Read mm. 1–4 of Clair de Lune, view the piano roll, analyze the phrase, …",
    "session": [
      { "turn": 1, "role": "user",      "content": "Show me measures 1–4 of Clair de Lune and describe the opening atmosphere." },
      { "turn": 2, "role": "assistant", "content": "Let me view the piano roll for mm. 1–4.",
        "tool_calls": [{ "tool": "view_piano_roll", "arguments": { "songId": "clair-de-lune", "startMeasure": 1, "endMeasure": 4 } }] },
      { "turn": 3, "role": "tool", "tool": "view_piano_roll",
        "content": { "svg_returned": true, "measures": 4, "rh_notes": 32, "lh_notes": 0 } }
      /* … assistant → tool → assistant, ending in a grounded analysis … */
    ]
  },
  "eval_metadata": { "split": "test", "leakage_check": "…", "eval_eligibility": "…" }
}

• scope locates the phrase — song, measures, key, tempo, meter, and its role in the piece.
• observation is the phrase itself in three synchronized views: a MIDI sidecar (timed_events: note, timing, velocity, hand, measure/beat), REMI + ABC token strings, and a rendered piano-roll SVG.
• annotation_target is the human teaching layer — structure, key moments, goals, style tips, per-measure technique notes.
• target_trace is the supervised signal: a multi-turn MCP session where the assistant calls the inspector tools on this phrase and answers from their results. This is what teaches grounded tool-use, not prose recall.
• provenance carries the license + verification chain; eval_metadata carries the split.

Load it

The dataset viewer renders every record (nested JSON), and the datasets library loads it directly:

from datasets import load_dataset

ds = load_dataset("mcp-tool-shop/jam-actions-v0", split="train")   # all 57 records; split tag is per-row
rec = ds[0]
print(rec["id"], "·", rec["scope"]["musical_phrase_label"])
print("notes:", len(rec["observation"]["midi_sidecar"]["timed_events"]),
      "· trace turns:", len(rec["target_trace"]["session"]))

# clair-de-lune is the locked held-out test song — never used for training:
held_out = ds.filter(lambda r: r["split"] == "test")

(records.jsonl carries both train and test records, each tagged with its split; splits.json pins clair-de-lune as the held-out song.)

Reproducibility

A fresh contributor cloning the source repository on any platform (Windows native, macOS, Linux, WSL) can verify the package's integrity and rebuild it:

# 1. Clone and check out this version's tag.
git clone https://github.com/mcp-tool-shop-org/ai-jam-sessions.git
cd ai-jam-sessions
git checkout jam-actions-v0-0.6.0

# 2. Install deps (pnpm 10+ recommended).
pnpm install

# 3a. Verify package checksums. Exit 0 on success; exit 1 with
#     `[bad line] / [hash mismatch] / [missing on disk]` lines on failure.
pnpm exec tsx scripts/verify-public-package-checksums.ts

# 3b. Rebuild the package from the source corpus. The library evidence gate
#     runs before anything is written and fails closed.
pnpm exec tsx scripts/package-jam-actions-public.ts --today 2026-09-25 --dry-run

# 3c. Re-run the standing execution gate: every unique frozen tool call in the
#     package replays against the live MCP server (0 failures required).
#     Requires a machine with an audio device.
pnpm build
pnpm exec tsx scripts/verify-public-package-execution.ts

The eval artifacts and release-gate verdicts published with 0.5.0 remain reproducible from the source repository at tag jam-actions-v0-0.5.0-cut-2026-07-11; they describe the withdrawn 115-record composition and are not re-measured on 0.6.0.

Source Data

MIDI arrangements are by Bernd Krueger, published at piano-midi.de under CC-BY-SA 3.0 (DE jurisdiction). Each file carries Krueger's own copyright credit. The underlying compositions are all in the public domain in both the US and EU (composer death + 70 years elapsed; latest of the 4 composers, Debussy, d. 1918).

Songs included (alphabetical):

• bach-prelude-c-major-bwv846
• clair-de-lune
• fur-elise
• mozart-k545-mvt1

Licensing

This dataset is layered:

1. Compositions — public domain (US: published before 1931; EU: composer death + 70 years elapsed).
2. Arrangements (MIDI sequences) — Bernd Krueger, piano-midi.de, CC-BY-SA 3.0 (DE) — https://creativecommons.org/licenses/by-sa/3.0/de/
3. Derivative records (this dataset) — CC-BY-SA-3.0-DE — share-alike inherited from the upstream arrangements.

HuggingFace's enumerated license slugs do not include the -de jurisdiction; the dataset card YAML uses cc-by-sa-3.0 and the DE jurisdiction is documented here in the body and in LICENSE-DATASET.md.

Attribution requirements when using this dataset:

• Cite Bernd Krueger and piano-midi.de when using the MIDI bytes or sequences.
• Cite this dataset (see CITATION.cff) when using the records, traces, or derived tokenizations.

Held-out Test Set

clair-de-lune (12 records) is the canonical held-out test set. It is never to be used for training. The remaining 45 records form the train split. The held-out choice is stratified by composer + style era: Debussy's Impressionist (1905) voicing is distinct from every training-set composer's idiom, so leakage from train to test is structurally low.

Split discipline is preserved across the packaging: every pair (prompt + continuation_target) is in the same split, and clair-de-lune was held out from the start of v0.

Provenance

Two layers of evidence stand behind every record:

1. Slice 2.5 URL verification (2026-05-17) confirmed each song's piano-midi.de composer page, licence marker and work listing. The per-song report is shipped as provenance-verification.json, filtered to the 4 public songs.
2. The library evidence gate (0.6.0) checks each record against the source repository's library provenance block for its song, which is re-derived from the MIDI bytes. A record ships only if the block names a redistributable arrangement licence, the file's own title matches the catalogue, and the record's observation.midi_sidecar.midi_sha256 equals the evidenced file's hash.

Each record's provenance block carries its own verdict_reason, verifier, verified_at, and arrangement_evidence_url byte-for-byte from the source corpus. None of these fields are re-derived during packaging.

Citation

See CITATION.cff for machine-readable metadata. BibTeX equivalent:

@dataset{jam_actions_v0_public_2026,
  author       = {{mcp-tool-shop-org} and Krueger, Bernd},
  title        = {jam-actions-v0 — AI Jam Sessions tool-use traces (public subset)},
  version      = {0.6.0},
  year         = {2026},
  publisher    = {Zenodo},
  doi          = {10.5281/zenodo.22961580},
  license      = {CC-BY-SA-3.0-DE},
  url          = {https://doi.org/10.5281/zenodo.22961580}
}

Limitations

• Four songs withdrawn in 0.6.0 (Chopin Op. 9 No. 2 and Op. 28 No. 4, Beethoven "Pathétique" II, Schumann "Träumerei"); see Version 0.6.0 correction.
• Satie Gymnopédie No. 1 and Debussy Arabesque No. 1 were never in this public subset. Slice 2.5 could not confirm their provenance against piano-midi.de. Both songs remain in the source repo with record_verdict: "internal".
• Small and single-arranger. 57 records over 4 works by one arranger; the train split covers three composers.
• No vocal records. v0 ships only instrument records.
• Piano only. All 4 songs are solo-piano arrangements.
• English-only annotations. Teaching-note text is English-only.

Maintainer

mcp-tool-shop-org — please open an issue at https://github.com/mcp-tool-shop-org/ai-jam-sessions for questions, corrections, or contributions.