{
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  "record_format_version": null,
  "record_format_note": "Draft format (spec §5.7-5.9, §9.4 sketch), same layout family as the take 5/6 records.",
  "performance": {
    "id": "perf_bwv846-search",
    "id_note": "Local id. NC has no Performance id registry yet.",
    "title": "The C major Prelude, harmony only (after Bach, BWV 846): search-driven take",
    "performed_at": "2026-10-18T01:41:42Z",
    "performed_at_local": "2026-10-17T18:41:42-07:00",
    "performed_at_note": "From the mtime of the WAV master (America/Los_Angeles, UTC-7).",
    "duration_s": 125.852,
    "music_ends_at_s": 122.852,
    "performer_mode": "algorithmic",
    "performer_id": null,
    "performer": {
      "name": "Astrid, NetComposer Algorithmic Performer (stand-in script on the box, not the netcomposer CLI)",
      "script": {
        "path": "bach/render846_search.py",
        "sha256": "fe88e97a980f30ad0df72cc974ba5956a0b93b8f94e88a17da433c7b69ab201e"
      }
    },
    "rules_set_by": {
      "id": null,
      "display_name": "Peter",
      "note": "Principle set by Peter: the Composition gives only chords, bars and tempo shape; rhythm, figuration, texture and timbre come from what the search finds."
    },
    "composition_ref": {
      "composition_id": "compositions/bach_bwv846_prelude_progression.md",
      "sha256": "f63acadc04937a289a2f51c96386a0ae92de8f7fba00c69a16a038632b9b43d5",
      "composer": {
        "id": null,
        "display_name": "Peter"
      },
      "music": "Johann Sebastian Bach, Prelude in C major, BWV 846, Das Wohltemperierte Klavier I (1722). Public domain.",
      "analysis": {
        "credit": "Mark Gotham et al., When in Rome corpus",
        "uri": "https://github.com/MarkGotham/When-in-Rome",
        "license": "CC-BY-SA-4.0"
      },
      "used_from_composition": [
        "chord anchors (one per bar, parsed from the Composition text)",
        "35 bars, 4/4",
        "69 BPM",
        "broadening bars 33-35 (+4%, +10%, +18%)",
        "sections from the prose (1-11, 12-14, 15-19, 20-23, 24-31, 32-35)",
        "two gestures per bar",
        "bar 35 held and ringing"
      ],
      "not_used": "Bach's written notes. No score, MIDI or kern file is read by this Performer."
    },
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      "seed": 846,
      "rhythm": "Per section, the next sound in search order with 6+ onsets (rate 1.5-12/s) becomes the rhythm donor. 4-8 of its onsets, time-scaled to a half bar, are the attack times, played twice per bar.",
      "figure_contour": "At each donor onset, the donor's spectral brightness picks the register: brighter -> higher chord tone among the found notes.",
      "dynamics": "Donor onset level -> note gain (0.55-1.0).",
      "notes": "Found single notes (one measured pitch class, within 25 cents of A440, no pitch-shift) that are chord tones. Section voice = the contributor whose notes cover the most chord tones; missing tones filled from others in search order.",
      "bed": "Found chordal sound whose measured pitch classes are all chord tones, with >= 70% of chroma energy in the chord; time-stretched (max 2x) if shorter than the bar.",
      "bass": "One contributor (best coverage of written bass/root); where it has no matching note the bass is let go.",
      "texture": "The donor's own audio is heard only when it is unpitched or fits the bar's chord.",
      "tempo_map": {
        "bpm": 69,
        "rit_bar_extension": {
          "33": 0.04,
          "34": 0.1,
          "35": 0.18
        }
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      "transforms_enabled": [
        "trim",
        "gain",
        "fade",
        "time_stretch"
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      "pitch_shift": false
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      "queries": 65,
      "first_query_at": "2026-10-17T18:08:09-0700",
      "last_query_at": "2026-10-17T18:09:26-0700",
      "filter": "license:(\"Creative Commons 0\" OR \"Attribution\") duration:[0.4 TO 40]",
      "candidates": 927,
      "analyzed": 927,
      "usable": 922,
      "in_tune_tonal": 714,
      "single_notes": 206,
      "chordal": 485,
      "rhythm_donor_candidates": 471,
      "audio": "HQ mp3 previews (lossy). Lossless originals need an OAuth2 login."
    },
    "bars": [
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      "credit_line": "“Original Song -m Sibelius.aif” by xbkyboox (https://freesound.org/people/xbkyboox/sounds/185770/), CC0 1.0",
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      "note": "Its onset times and per-onset brightness/level shaped the figure in this section; its audio is not in the mix."
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      "credit_line": "“eastboundkieb g major scale 130 bpm.wav” by eastboundkieb (https://freesound.org/people/eastboundkieb/sounds/572381/), CC0 1.0",
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      "note": "Its onset times and per-onset brightness/level shaped the figure in this section; its audio is not in the mix."
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    {
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        "name": "CC BY 4.0",
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    "rhythm_donors": 6,
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      "xbkyboox"
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    ],
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      "CC BY 4.0",
      "CC0 1.0"
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      "ND",
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      "custom"
    ],
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      "CC BY 4.0",
      "CC0 1.0",
      "CC BY-SA 4.0 (When in Rome analysis)",
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    "check": "OK: inputs are CC0, CC BY 3.0/4.0, CC BY-SA 4.0 and public domain; no NC, ND or Sampling+. Output CC BY-SA 4.0 with attribution."
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      "what": "Contributor display name changed from 'Petrus' to 'Peter' (Peter Semmelhack) for netcomposer.art, at his request. No audio, input, setting or other field changed.",
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}