{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.third","code":"thing-q224074","url":"https://ver.cy/models/thing/q224074/","name":"third","alternateNames":["major third","minor third","augmented third","neutral third","septimal minor third"],"kind":"thing","status":"published","version":"0.2.0-wave.1","language":"en","classifiers":{"family":"Thing Registry","category":"Cross-cutting context","entryKind":"thing","plane":"XCT","domain":["XCT.REL"],"industry":[],"navPath":"","tags":[],"facets":{}},"whatItIs":"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.","purpose":"Let an agent handle thirds by quality, size, tuning and role in harmony.","scope":{"in":[],"out":[],"boundaries":[]},"distinguishingFeatures":["Spans three scale degrees","Quality depends on semitones","Defines major and minor chords","Tuning differs between systems"],"structure":{"bundles":[{"id":"interval","name":"Interval","description":"Which third.","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.","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.","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.","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"}]}]}]}]},"agentConduct":{"may":["Name, explain and identify thirds in music.","Note when a tuning system makes a third differ from equal temperament."],"mustNot":["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."],"requiresHuman":["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."],"affectedParties":["Musicians and learners","Musical traditions outside the Western canon"]},"owners":{"steward":"Nobody owns the concept; it is held in common by music theory.","roles":[],"masterSystems":[]},"relations":[{"target":"Q189962","type":"parent","note":"registry parent class"},{"target":"musical interval","type":"related","note":"category"},{"target":"triad","type":"related","note":"chord"},{"target":"tuning system","type":"related","note":"theory"},{"target":"third (ordinal or fraction)","type":"related","note":"other senses"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.third","Wikidata: Q224074 (https://www.wikidata.org/wiki/Q224074)"]},"properties":{"applicability":"not-applicable","items":["major third (equal temperament): 400 cents","minor third (equal temperament): 300 cents"]},"recognition":{"applicability":"optional","items":["Major and minor thirds","Semitone count","The ordinal third or a fraction are other senses","Two notes three letter names apart on the staff."]},"capabilities":{"applicability":"required","items":["identify the quality of a third","build triads","compare tuning systems","train ear recognition"]},"hazards":{"applicability":"required","items":["Miscounting semitones","Confusing enharmonic spellings"]},"interfaces":{"applicability":"not-applicable","items":[]},"context":{"applicability":"required","items":["Building chords and melodies; thirds define major and minor harmony.","major third","minor third","augmented and diminished thirds","neutral third","just and septimal thirds"]}},"sources":[{"title":"Wikidata item Q224074: third","url":"https://www.wikidata.org/wiki/Q224074","note":"identity and sense of the item"},{"title":"Third (music)","url":"https://en.wikipedia.org/wiki/Third_(music)","note":"The musical interval spanning three staff positions."},{"title":"Major third","url":"https://en.wikipedia.org/wiki/Major_third","note":"The third comprising four semitones."},{"title":"Minor third","url":"https://en.wikipedia.org/wiki/Minor_third","note":"The third comprising three semitones."}],"openQuestions":["Should third qualities be separate entries?","How should tuning systems be linked?","How should other senses be split off?"],"resources":{"spec":"/models/things/publications/thing-q224074/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q224074/spec.json"],"providers":["Claude"],"researchStatus":"unreviewed","generatedAt":"2026-09-11T09:00:23Z","builder":"tools/build_cards.py@1.0.0"},"completeness":{"sections":{"classifiers":"filled","whatItIs":"filled","purpose":"filled","distinguishingFeatures":"filled","structure":"filled","agentConduct":"filled","ethics":"filled","owners":"filled","relations":"filled","interaction.identity":"filled","interaction.properties":"not-applicable","interaction.recognition":"filled","interaction.capabilities":"filled","interaction.hazards":"filled","interaction.interfaces":"not-applicable","interaction.context":"filled","sources":"filled"},"notes":{"_gate":"Published through the thing publication gate 1.0 on 2026-10-07T12:51:16+00:00: completeness 1.00; sense: Wikidata description; 4 live sources; review by codex: pass","interaction.properties":"Plane XCT: no invented physical properties.","interaction.interfaces":"No formal standard, law or official classification specifically governs the musical interval of a third."},"score":1.0}}