{
 "challenge_id": "cymbal2-crash-v1",
 "title": "Bowed, belled and tapered crash cymbal struck three times by a drum stick, on the bell, at half the radius and near the rim: radiated pressure",
 "generated": "2026-09-18T18:11:33+00:00",
 "metrics": [
  "spectrogram_l2",
  "waveform_l2"
 ],
 "primary_metric": "spectrogram_l2",
 "reference": null,
 "reference_selection": {
  "rule": "none",
  "candidates": []
 },
 "order_violations_vs_reference": [],
 "solutions": [],
 "pairwise": {},
 "submissions": []
}