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  "language": "en",
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  "source": {
    "id": "happy-birthday-heavy-metal",
    "title": "Happy Birthday · Heavy-Metal Scream Version",
    "genre": "Heavy Metal · 160 BPM",
    "source": "Adapted from Happy Birthday to You",
    "editType": "Tempo change: 97 → 160 BPM · Style rearrangement",
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    "tags": "heavy metal, harsh screamed vocals, distorted guitars, double-kick drums, 160 BPM\n",
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    "titleZh": "",
    "sourceTitleZh": "",
    "sourceUrl": "https://www.youtube.com/watch?v=c-v-7JRisLA"
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      "monitor_error": null,
      "exception": null
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    "artifact_directory": "outputs/official_fullsong/cover_birthday/attempt-2",
    "prior_attempts": [
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        "attempt": 1,
        "status": "failed",
        "error": "RuntimeError: AC power is required for an acceptance benchmark",
        "receipt_path": "outputs/official_fullsong/cover_birthday/measurement.json",
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  "local_player": "audio/fullsong/f5f5adf90d99f7a0a548.mp3",
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      "monitor_error": null,
      "exception": null
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  "local_player_8step": "audio/fullsong/3d90709acca67112e636.mp3"
}
