{
  "name": "Selekt CC0 Chord-Progression Sample (BTC auto-annotated)",
  "description": "A small, neutral, public sample of 400 public-domain recordings auto-annotated with time-stamped chord progressions. IMPORTANT: chord labels are BTC-PREDICTED, not human-verified — suitable for training, weak supervision, and exploration, NOT a gold-standard benchmark (you cannot fairly benchmark BTC against BTC-generated labels). A deliberately random, representative slice of a much larger corpus; not a curated best-of.",
  "version": "1.0",
  "generated": "2026-06-19",
  "annotations_license": "CC0-1.0 — chord annotations dedicated to the public domain by Selekt.",
  "audio_provenance": "Underlying audio is public domain via the U.S. Library of Congress (Citizen DJ). No audio is redistributed here — fetch each recording at its source_url.",
  "chord_label_format": "BTC large-vocabulary root[:quality] (e.g. \"C\", \"A#:7\"); \"N\" = no chord. Times in seconds.",
  "funnel": "Explore the full, continuously-updated catalog of progressions on the Selekt Chord Progression Finder: https://selektaudio.com/tools/chord-progressions",
  "count": 400,
  "schema": {
    "source_id": "stable identifier at the public source",
    "source_url": "public URL where the audio can be fetched",
    "license": "license of the underlying audio (PD = public domain)",
    "key": "detected musical key",
    "bpm": "detected tempo",
    "chord_progression": "[{ start, end, chord }] — BTC-predicted, seconds"
  },
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