{
  "title": "ToneTwin 508-tone vetted catalog study",
  "snapshot_date": "2026-07-20",
  "methodology": "https://tone-twin.com/research-methodology",
  "scope": {
    "public_tone_records": 508,
    "unique_song_artist_pairs": 508,
    "artists": 233,
    "genres": 21,
    "retained_citation_links": 1659,
    "songs_with_citations_pct": 100,
    "median_citations_per_song": 3
  },
  "signal_chains": {
    "songs_with_chain": 508,
    "coverage_pct": 100,
    "gear_items": 1737,
    "mean_items": 3.42,
    "median_items": 3,
    "songs_with_pedal_or_effect": 346,
    "songs_with_pedal_or_effect_pct": 68.1,
    "gear_item_types": {
      "instruments": 531,
      "amplifiers": 518,
      "pedals_or_effects": 504,
      "cabinets_or_speakers": 184
    }
  },
  "leading_manufacturers": {
    "instruments": [["Gibson", 191], ["Fender", 147], ["Ibanez", 21]],
    "amplifiers": [["Marshall", 146], ["Fender", 139], ["Mesa/Boogie (normalized)", 51], ["Vox", 21]],
    "pedals_and_effects": [["Boss", 86], ["MXR", 50], ["Ibanez", 49], ["Dunlop", 24], ["Electro-Harmonix", 19]]
  },
  "tunings": {
    "standard_e": 367,
    "e_flat_standard": 65,
    "drop_d": 20,
    "other_drop": 20,
    "open": 11,
    "other_alternate": 23,
    "dadgad": 2
  },
  "notes": [
    "The public snapshot retains vetted V2-backed records and excludes legacy V1 research and duplicate variants.",
    "Every public record is a unique normalized song and artist pair in this snapshot.",
    "Historical knob values were excluded from the study.",
    "Obvious maker spelling variants were normalized for aggregate manufacturer counts.",
    "Manufacturer counts are gear-item occurrences, so one song can contribute more than one item.",
    "The catalog is broad and curated, not popularity-weighted.",
    "Counts describe the catalog's current research records and should not be read as proof for an individual recording."
  ]
}