{
  "preparedAt": "2026-09-11T04:39:21.244863+00:00",
  "sources": [
    {
      "id": 527783,
      "author": "ValentinSosnitskiy",
      "title": "G - C - D - Chord",
      "page": "https://freesound.org/people/ValentinSosnitskiy/sounds/527783/",
      "url": "https://cdn.freesound.org/previews/527/527783_3908940-hq.mp3",
      "file": "gcd-96bpm.mp3",
      "reference": {
        "tempoBpm": 96,
        "chords": [
          "G major",
          "C major",
          "D major"
        ],
        "keyNote": "The uploader names the chords; G major is our harmonic interpretation, not a supplied ground-truth key label."
      },
      "sha256": "e6247098d1c99c0120251c74fd24c445da74a1822278dd06a3b673ae458017ef",
      "license": "CC0 1.0",
      "licenseUrl": "https://creativecommons.org/publicdomain/zero/1.0/",
      "delivery": "Public high-quality MP3 preview; not the original uploaded WAV."
    },
    {
      "id": 555911,
      "author": "deadrobotmusic",
      "title": "messy acoustic guitar loop [E Major] [128bpm]",
      "page": "https://freesound.org/people/deadrobotmusic/sounds/555911/",
      "url": "https://cdn.freesound.org/previews/555/555911_11532701-hq.mp3",
      "file": "acoustic-128bpm.mp3",
      "reference": {
        "tempoBpm": 128,
        "keyNote": "The uploader describes E major or C-sharp minor; these are relative keys."
      },
      "sha256": "2d355fdb41cc4f14d56cda6e29ffcd164726a4fdc5ed43ea1e6eca4a736f3efa",
      "license": "CC0 1.0",
      "licenseUrl": "https://creativecommons.org/publicdomain/zero/1.0/",
      "delivery": "Public high-quality MP3 preview; not the original uploaded WAV."
    }
  ],
  "vocal": {
    "source": "Producer Space — Soulful House Vocals",
    "page": "https://producerspace.com/",
    "license": "CC0 (existing reviewed demo)",
    "file": "/demo/autotune-demo.wav",
    "sha256": "c9ff33dc20eb02cf2b3d87e5b2088b8739d20e308a567b8daf21d78b8f200890"
  },
  "mix": {
    "file": "guitar-vocal-mix.wav",
    "sha256": "cda5115cc57f08dfafcd99818ecfcd09b7d478f316fe284977ff9fab519e54b6",
    "durationSeconds": 15,
    "guitarGain": 0.45,
    "vocalGain": 0.55,
    "vocalPlacement": "One 7.5-second take at the start, then silence",
    "peak": 0.421783447265625,
    "note": "LA Studio teaching mix made from separately recorded guitar and vocal sources. Not an original song, a six-instrument recording or a separation-accuracy benchmark."
  },
  "reference": {
    "file": "guitar-reference.wav",
    "sha256": "aa2f8d642d20158651b91bec14b13685aa92a296e1b89e2d92d776858bbe5f3d",
    "note": "The same guitar at its gain in the input, before the vocal was mixed in."
  },
  "ffmpeg": "ffmpeg version 8.0.1 Copyright (c) 2000-2025 the FFmpeg developers"
}