{
  "vercy": "1.0-draft",
  "publication": {
    "status": "research-draft",
    "adjudicationStatus": "unreviewed",
    "publishableCanonical": false,
    "generatedAt": "2026-09-11T09:00:23Z",
    "providers": [
      "Claude"
    ],
    "breadth": "written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify",
    "pass": 2,
    "wave": 1,
    "engine": "claude",
    "enrichment": {
      "pass": 3,
      "engine": "claude",
      "producedAt": "2026-10-05T16:30:00Z",
      "ingestedAt": "2026-10-05T13:19:01+00:00",
      "fields": [
        "agent_conduct",
        "ethics",
        "owners"
      ]
    },
    "gate": {
      "passed": true,
      "version": "1.0",
      "at": "2026-10-07T12:51:16+00:00",
      "evidence": [
        "completeness 1.00",
        "sense: Wikidata description",
        "4 live sources",
        "review by codex: pass"
      ]
    }
  },
  "metaModel": {
    "id": "THING-Q224074",
    "registryId": "vr.tr.third",
    "name": "third",
    "version": "0.2.0-wave.1",
    "entryKind": "thing",
    "family": "Thing Registry",
    "domain": [
      "XCT.REL"
    ],
    "status": "research-draft"
  },
  "canonicalUrl": "https://ver.cy/models/thing/q224074/",
  "model": {
    "registry_id": "vr.tr.third",
    "name": "third",
    "purpose": "Let an agent handle thirds by quality, size, tuning and role in harmony.",
    "definition": "In music, an interval spanning three diatonic scale degrees, such as the major third (four semitones) and minor third (three semitones), with other forms like augmented, neutral and septimal thirds.",
    "what_it_is_for": "Building chords and melodies; thirds define major and minor harmony.",
    "affordances": [
      "identify the quality of a third",
      "build triads",
      "compare tuning systems",
      "train ear recognition"
    ],
    "distinguishing_features": [
      "Spans three scale degrees",
      "Quality depends on semitones",
      "Defines major and minor chords",
      "Tuning differs between systems"
    ],
    "appearance": "Two notes three letter names apart on the staff.",
    "visual_identification": [
      "Major and minor thirds",
      "Semitone count",
      "The ordinal third or a fraction are other senses"
    ],
    "physical_properties": [
      {
        "quantity": "major third (equal temperament)",
        "typical_range": "400",
        "unit": "cents",
        "note": ""
      },
      {
        "quantity": "minor third (equal temperament)",
        "typical_range": "300",
        "unit": "cents",
        "note": ""
      }
    ],
    "families_and_kinds": [
      "major third",
      "minor third",
      "augmented and diminished thirds",
      "neutral third",
      "just and septimal thirds"
    ],
    "related_models": [
      {
        "relation": "is a kind of",
        "target": "musical interval",
        "why": "category"
      },
      {
        "relation": "forms",
        "target": "triad",
        "why": "chord"
      },
      {
        "relation": "is tuned by",
        "target": "tuning system",
        "why": "theory"
      },
      {
        "relation": "is confused with",
        "target": "third (ordinal or fraction)",
        "why": "other senses"
      }
    ],
    "identifiers": [],
    "standards_and_regulation": [],
    "failure_modes_and_hazards": [
      "Miscounting semitones",
      "Confusing enharmonic spellings"
    ],
    "in_scope": [],
    "out_of_scope": [],
    "characteristics": [],
    "agent_conduct": {
      "may": [
        "Name, explain and identify thirds in music.",
        "Note when a tuning system makes a third differ from equal temperament."
      ],
      "must_not": [
        "Present one tradition's tuning as the only correct one.",
        "Attribute a musical composition or arrangement to a person without evidence.",
        "Reproduce copyrighted scores or recordings while illustrating the interval."
      ],
      "requires_human": [
        "Publishing teaching material that will be used as an exam reference."
      ]
    },
    "ethics": {
      "considerations": [
        "Music cultures differ in how they tune and value intervals; one is not more correct than another.",
        "Musicians' recordings and scores used as examples are their protected work."
      ],
      "affected_parties": [
        "Musicians and learners",
        "Musical traditions outside the Western canon"
      ]
    },
    "owners": {
      "steward": "Nobody owns the concept; it is held in common by music theory.",
      "master_systems": []
    },
    "facets_not_applicable": {
      "interfaces": "No formal standard, law or official classification specifically governs the musical interval of a third."
    }
  },
  "sources": [
    {
      "id": "wikidata",
      "title": "Wikidata item Q224074: third",
      "url": "https://www.wikidata.org/wiki/Q224074",
      "url_status": "live",
      "what_it_supports": "identity and sense of the item",
      "checked_by": "wikidata-api"
    },
    {
      "id": "found-2",
      "title": "Third (music)",
      "url": "https://en.wikipedia.org/wiki/Third_(music)",
      "url_status": "live",
      "checked_by": "http 200",
      "what_it_supports": "The musical interval spanning three staff positions."
    },
    {
      "id": "found-3",
      "title": "Major third",
      "url": "https://en.wikipedia.org/wiki/Major_third",
      "url_status": "live",
      "checked_by": "http 200",
      "what_it_supports": "The third comprising four semitones."
    },
    {
      "id": "found-4",
      "title": "Minor third",
      "url": "https://en.wikipedia.org/wiki/Minor_third",
      "url_status": "live",
      "checked_by": "http 200",
      "what_it_supports": "The third comprising three semitones."
    }
  ],
  "structure": {
    "bundles": [
      {
        "id": "interval",
        "name": "Interval",
        "description": "Which third.",
        "rationale": "Quality defines it.",
        "layers": [
          {
            "id": "quality",
            "name": "Quality",
            "description": "Major or minor.",
            "findings": [
              {
                "id": "quality-finding",
                "name": "Quality",
                "description": "Quality.",
                "questions": [
                  {
                    "text": "Is this third major, minor or another quality?",
                    "kind": "definition"
                  },
                  {
                    "text": "How many semitones does it span?",
                    "kind": "measurement"
                  }
                ]
              }
            ]
          },
          {
            "id": "spelling",
            "name": "Spelling",
            "description": "Note names.",
            "findings": [
              {
                "id": "spelling-finding",
                "name": "Spelling",
                "description": "Spelling.",
                "questions": [
                  {
                    "text": "How is it spelled in this key?",
                    "kind": "definition"
                  },
                  {
                    "text": "Is an enharmonic spelling confusing it?",
                    "kind": "boundary"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "harmony",
        "name": "Harmony",
        "description": "Chords.",
        "rationale": "Thirds build chords.",
        "layers": [
          {
            "id": "triads",
            "name": "Triads",
            "description": "Major and minor chords.",
            "findings": [
              {
                "id": "triads-finding",
                "name": "Triads",
                "description": "Triads.",
                "questions": [
                  {
                    "text": "How do thirds stack to form triads?",
                    "kind": "definition"
                  },
                  {
                    "text": "Which third makes a chord major or minor?",
                    "kind": "definition"
                  }
                ]
              }
            ]
          },
          {
            "id": "voice-leading",
            "name": "Voice leading",
            "description": "Parts.",
            "findings": [
              {
                "id": "voice-leading-finding",
                "name": "Voice leading",
                "description": "Voice leading.",
                "questions": [
                  {
                    "text": "How do thirds behave in voice leading?",
                    "kind": "definition"
                  },
                  {
                    "text": "Should the third be doubled?",
                    "kind": "boundary"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "tuning",
        "name": "Tuning",
        "description": "Size.",
        "rationale": "Tuning changes size.",
        "layers": [
          {
            "id": "systems",
            "name": "Systems",
            "description": "Equal and just.",
            "findings": [
              {
                "id": "systems-finding",
                "name": "Systems",
                "description": "Tuning systems.",
                "questions": [
                  {
                    "text": "How large is the third in this tuning system?",
                    "kind": "measurement"
                  },
                  {
                    "text": "How does it sound compared with just intonation?",
                    "kind": "definition"
                  }
                ]
              }
            ]
          },
          {
            "id": "traditions",
            "name": "Traditions",
            "description": "Other musics.",
            "findings": [
              {
                "id": "traditions-finding",
                "name": "Traditions",
                "description": "Other traditions.",
                "questions": [
                  {
                    "text": "Do other musical traditions use neutral thirds?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Where?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "learning",
        "name": "Learning",
        "description": "Ear training.",
        "rationale": "Recognition takes practice.",
        "layers": [
          {
            "id": "ear",
            "name": "Ear",
            "description": "Recognition.",
            "findings": [
              {
                "id": "ear-finding",
                "name": "Ear",
                "description": "Ear training.",
                "questions": [
                  {
                    "text": "How can major and minor thirds be recognised by ear?",
                    "kind": "action"
                  },
                  {
                    "text": "Which reference songs help?",
                    "kind": "action"
                  }
                ]
              }
            ]
          },
          {
            "id": "senses",
            "name": "Senses",
            "description": "Disambiguation.",
            "findings": [
              {
                "id": "senses-finding",
                "name": "Senses",
                "description": "Other senses.",
                "questions": [
                  {
                    "text": "Is the ordinal third or the fraction one third meant?",
                    "kind": "boundary"
                  },
                  {
                    "text": "Which entry fits?",
                    "kind": "action"
                  }
                ]
              }
            ]
          }
        ]
      }
    ]
  },
  "openQuestions": [
    "Should third qualities be separate entries?",
    "How should tuning systems be linked?",
    "How should other senses be split off?"
  ],
  "statistics": {
    "bundles": 4,
    "layers": 8,
    "findings": 8,
    "questions": 16
  }
}