---
license: cc0-1.0
license_name: mixed-cc0-cc-by
pretty_name: CometBeat Assets
tags:
  - music
  - music-education
  - soundfont
  - musicxml
  - abc
  - kern
  - gabc
  - midi
---

# CometBeat Assets

Curated, rights-verified assets for the **CometBeat** music-education app —
SoundFonts, instruments, samples, and a large symbolic **score** corpus. Every
item is published with a per-item `license` + `attribution` in the catalog JSON.

## What ships here (tiers)

Only **Tier A** and **Tier B** are published. Tier C (Share-Alike) and Tier D
(Non-Commercial) are **never** in this dataset.

| Tier | Licences | Obligation |
|---|---|---|
| **A** | CC0 / Public Domain / MIT | none |
| **B** | CC BY 3.0 / 4.0 (attribution) | **must credit the author** — carried per item in `attribution`, shown in the app's "Sources & credits" |
| ~~C~~ | ~~CC BY-SA / ODbL (share-alike)~~ | not published here |
| ~~D~~ | ~~any Non-Commercial~~ | not published here |

## Attribution (Tier B)

Each Tier-B item carries an `attribution` string (composer / editor / source).
Re-users must preserve it. Sources of the Tier-B content:
**NIFC / The Fryderyk Chopin Institute** (Polish scores + Chopin first editions,
CC BY), **Mutopia Project** (CC BY items), **EGSet12**, and CC-BY tracker modules.

## Layout

- `catalog/index.json` — the small index the app reads first (per-kind shards).
- `catalog/{soundfont,instrument,sample,module,score}.json` — per-kind shards;
  each item has `license`, `attribution`, `tier` (A/B), `path`.
- `catalog.json` — the full combined catalog.
- `assets/…`, `gregobase/…`, `nifc/…`, `pdmx/…`, `mutopia/…`, … — the payloads
  (score paths are md5-bucketed so no directory exceeds HF's 10k-files limit).

Content policy: symbolic music only (MIDI/MusicXML/kern/ABC/GABC/GP) + audio only
as an instrument/sample payload (SFZ/SF2). Provenance is verified per source; the
publish gate excludes Share-Alike, Non-Commercial, and unclear-licence material.