{ "model": { "rank": 16890, "code": "thing-q944899", "model_id": "vr.tr.3-note-chord", "name": "3-note chord", "purpose": "Let an agent define three-note chords and triads, explain their qualities, inversions and functions, relay notation and analysis conventions, and distinguish triads from other three-note chords and from larger chords.", "family": "Thing Registry", "category": "Cross-cutting context", "status": "research-draft", "kind": "thing", "plane": "XCT", "domain": "XCT.QLT", "industry": "", "version": "", "url": "/models/thing/q944899/", "tier": 2, "score": 31, "payload": { "layer": "wikidata", "aliases": [ "Contrast chord", "major chord", "diminished triad", "minor chord", "augmented chord", "six-four chord", "leading-tone triad", "Primary triad", "D major", "C major", "D♭ major", "E♭ major", "E major", "F major", "F♯ major", "G♭ major", "G major", "A♭ major", "A major", "B♭ major", "B major", "A♯ major", "B♯ major", "C♭ major", "C♯ major", "D♯ major", "E♯ major", "F♭ major", "G♯ major", "C minor", "C♯ minor", "D minor", "D♯ minor", "E♭ minor", "E minor", "F minor", "F♯ minor", "G minor", "A♭ minor", "A minor" ], "aliasCount": 50, "merged": 50, "knownIn": 31, "facets": null, "markers": [], "lexicalClass": "", "senseRank": null, "alsoRegisteredAs": null, "source": { "dataset": "wikidata", "item": "Q944899", "url": "https://www.wikidata.org/wiki/Q944899", "license": "CC0 1.0" } }, "research": { "vercy": "1.0-draft", "publication": { "status": "research-draft", "adjudicationStatus": "unreviewed", "publishableCanonical": false, "generatedAt": "2026-09-13T00:25:56Z", "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": 3, "engine": "claude" }, "metaModel": { "id": "THING-Q944899", "registryId": "vr.tr.3-note-chord", "name": "3-note chord", "version": "0.2.0-wave.3", "entryKind": "thing", "family": "Thing Registry", "domain": [ "XCT.QLT" ], "status": "research-draft" }, "canonicalUrl": "https://ver.cy/models/thing/q944899/", "model": { "registry_id": "vr.tr.3-note-chord", "name": "3-note chord", "purpose": "Let an agent define three-note chords and triads, explain their qualities, inversions and functions, relay notation and analysis conventions, and distinguish triads from other three-note chords and from larger chords.", "definition": "A chord of three notes, in Western tonal music most often a triad built of two stacked thirds above a root, giving major, minor, diminished and augmented triads, which can appear in root position or in first and second inversions such as the six-four chord; triads are the basic harmonic units of common practice music and popular music, and other three-note chords include suspended chords, quartal chords and contrast chords in some theoretical systems.", "what_it_is_for": "Harmony in Western music.", "affordances": [ "define triads and qualities", "explain inversions and functions", "relay notation conventions", "distinguish from other chords" ], "distinguishing_features": [ "Stacked thirds", "Four qualities", "Inversions", "Tonal function" ], "appearance": "Not a visible object; three notes sounded together, written stacked on a staff.", "visual_identification": [ "Chord of three notes", "Major, minor, diminished, augmented, inversions, suspended", "Dyads have two notes; seventh chords have four" ], "physical_properties": [ { "quantity": "notes", "typical_range": "3", "unit": "count", "note": "" }, { "quantity": "triad qualities", "typical_range": "4", "unit": "count", "note": "major, minor, diminished, augmented" } ], "families_and_kinds": [ "major and minor triads", "diminished and augmented triads", "inversions including the six-four chord", "suspended and quartal three-note chords", "contrast chords and other theoretical categories" ], "related_models": [ { "relation": "is a kind of", "target": "chord", "why": "in registry terms" }, { "relation": "is a kind of", "target": "triad", "why": "in registry terms" }, { "relation": "is built from", "target": "interval", "why": "thirds in tertian harmony" }, { "relation": "is contrasted with", "target": "seventh chord", "why": "a four-note chord" } ], "identifiers": [], "standards_and_regulation": [ "No regulation; music theory conventions and chord notation systems" ], "failure_modes_and_hazards": [ "Confusing inversions and qualities", "Applying tonal terms to non-tonal music", "Notation inconsistencies" ], "in_scope": [], "out_of_scope": [], "characteristics": [] }, "sources": [], "structure": { "bundles": [ { "id": "define", "name": "Define", "description": "What a triad is.", "rationale": "Theory.", "layers": [ { "id": "definition", "name": "Definition", "description": "Definition and qualities.", "findings": [ { "id": "definition-finding", "name": "Definition", "description": "Definition.", "questions": [ { "text": "What is a triad, and how do the four qualities differ?", "kind": "definition" }, { "text": "Is the chord a triad, another three-note chord or a larger chord?", "kind": "boundary" } ] } ] }, { "id": "inversions", "name": "Inversions", "description": "Inversions.", "findings": [ { "id": "inversions-finding", "name": "Inversions", "description": "Inversions.", "questions": [ { "text": "How do root position, first and second inversions work, including the six-four chord?", "kind": "definition" }, { "text": "Which entry fits the specific chord?", "kind": "action" } ] } ] } ] }, { "id": "use", "name": "Use", "description": "Function and practice.", "rationale": "Theory.", "layers": [ { "id": "function", "name": "Function", "description": "Harmonic function.", "findings": [ { "id": "function-finding", "name": "Function", "description": "Function.", "questions": [ { "text": "How do triads function in tonal harmony and progressions?", "kind": "provenance" }, { "text": "Which entry fits harmonic function?", "kind": "action" } ] } ] }, { "id": "practice", "name": "Practice", "description": "Playing and voicing.", "findings": [ { "id": "practice-finding", "name": "Practice", "description": "Practice.", "questions": [ { "text": "How are triads voiced and played on keyboard and guitar?", "kind": "action" }, { "text": "Which references are standard?", "kind": "provenance" } ] } ] } ] }, { "id": "notate", "name": "Notate", "description": "Notation and analysis.", "rationale": "Theory.", "layers": [ { "id": "notation", "name": "Notation", "description": "Notation.", "findings": [ { "id": "notation-finding", "name": "Notation", "description": "Notation.", "questions": [ { "text": "How are triads written in Roman numerals, figured bass and chord symbols?", "kind": "provenance" }, { "text": "Which sources are cited?", "kind": "provenance" } ] } ] }, { "id": "analysis", "name": "Analysis", "description": "Analysis.", "findings": [ { "id": "analysis-finding", "name": "Analysis", "description": "Analysis.", "questions": [ { "text": "How are triads identified in analysis, and what about other three-note chords?", "kind": "provenance" }, { "text": "Which entry fits music analysis?", "kind": "action" } ] } ] } ] }, { "id": "context", "name": "Context", "description": "History and acoustics.", "rationale": "Context.", "layers": [ { "id": "history", "name": "History", "description": "History.", "findings": [ { "id": "history-finding", "name": "History", "description": "History.", "questions": [ { "text": "How did the triad become the basis of Western harmony, from Zarlino to Rameau?", "kind": "provenance" }, { "text": "Which entry fits the history of music theory?", "kind": "action" } ] } ] }, { "id": "acoustics", "name": "Acoustics", "description": "Acoustics and perception.", "findings": [ { "id": "acoustics-finding", "name": "Acoustics", "description": "Acoustics.", "questions": [ { "text": "What do acoustics and psychology say about consonance of triads, with findings attributed?", "kind": "provenance" }, { "text": "Which entry fits consonance and dissonance?", "kind": "action" } ] } ] } ] } ] }, "openQuestions": [ "Should major chord and minor chord be separate entries?", "How should theory references be linked?", "The registry entry has merged aliases naming qualities and inversions; should they be split off?" ], "statistics": { "bundles": 4, "layers": 8, "findings": 8, "questions": 16 } }, "draft": { "generator": "vr.draft.v3", "status": "draft-generated", "researched": false, "archetype": "abstract concept", "method": "Written from the archetype playbook - what this kind of thing needs beyond identity and provenance - and from the structure that recurred across 6,333 models already researched by two engines. Applied to this entry by rule. No source was read for this thing and no claim here is researched. This entry carries no facets of its own, so they were inferred from its domain - a guess about a whole domain applied to one thing.", "facetsInferred": true, "nextPass": "A researcher replaces this draft with a sourced specification. Treat every sentence below as a proposal to argue with.", "purpose": "Give an agent a durable, checkable way to recognise a 3-note chord, record what state it is in, and decide what may be done with it.", "whatItIs": "Let an agent define three-note chords and triads, explain their qualities, inversions and functions, relay notation and analysis conventions, and distinguish triads from other three-note chords and from larger chords.", "characteristics": { "substance": "abstract", "origin": "conceptual", "agency": "inert" }, "whatYouCanDoWithIt": [ "observed and measured" ], "distinguishingFeatures": [ "Names folded into this entry, which a task may need to split apart again: Contrast chord, major chord, diminished triad, minor chord, augmented chord, six-four chord, leading-tone triad, Primary triad, D major, C major, D♭ major, E♭ major.", "50 finer distinctions are held as aliases rather than separate entries, because telling them apart needs a task that asks for it.", "Described in 31 Wikipedia languages, which is a measure of how widely the thing is known, not of how important it is." ], "openQuestionsForResearch": [ "Which of the bundles below does a real task actually need, and which are ceremony?", "What does this thing have that the facets do not capture at all?", "Which neighbouring kind is most often confused with a 3-note chord, and on what evidence are they told apart?" ], "whatItIsMadeOf": "an abstraction with no physical instance", "physicalCharacter": [ "Does nothing on its own; everything it does, something else did to it.", "These come from the domain this entry sits in rather than from the entry itself, so treat them as a first guess about the whole domain applied to one thing." ], "whatCanBeDoneWithIt": [ "observe it, measure it, record its state" ], "howItIsRecognised": [ "Nothing to see. What is recognised is an instance of it, and which instances count is exactly what is argued about." ], "relatedModels": [ { "relation": "covers", "note": "Finer kinds folded into this entry because telling them apart needs a task that asks for it. Each is a model waiting to be split out when one does.", "targets": [ "Contrast chord", "major chord", "diminished triad", "minor chord", "augmented chord", "six-four chord", "leading-tone triad", "Primary triad", "D major", "C major", "D♭ major", "E♭ major" ] } ], "standing": "Described in 31 Wikipedia languages, which measures how widely it is written about rather than how important or how common it is. 50 finer distinctions are held inside this entry as names rather than as separate models.", "structure": { "bundles": [ { "id": "identity-and-classification", "name": "Identity, naming and classification", "description": "How an agent tells one 3-note chord from another, and a 3-note chord from things that resemble it.", "rationale": "Recognition comes before every other claim. Without stable identity nothing else in the model can be trusted to be about the same thing twice.", "layers": [ { "id": "naming-and-identifiers", "name": "Names and identifiers", "description": "The names this thing goes by and the identifiers that survive translation and time.", "findings": [ { "id": "preferred-name-and-aliases", "name": "Preferred name, aliases and local names", "description": "Which name to use, which names mean the same thing, and which merely sound similar.", "questions": [ { "id": "preferred-name-and-aliases-q01", "text": "What identifies and describes the name of a 3-note chord, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "preferred-name-and-aliases-q02", "text": "Who or what asserted this about the name of a 3-note chord, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "preferred-name-and-aliases-q03", "text": "What may an agent decide or do once the name of a 3-note chord is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] }, { "id": "stable-identifiers", "name": "Stable identifiers and external keys", "description": "Identifiers that keep pointing at this kind of thing across systems and languages.", "questions": [ { "id": "stable-identifiers-q01", "text": "What identifies and describes an identifier for a 3-note chord, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "stable-identifiers-q02", "text": "Who or what asserted this about an identifier for a 3-note chord, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "stable-identifiers-q03", "text": "What may an agent decide or do once an identifier for a 3-note chord is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] }, { "id": "classification-and-granularity", "name": "Classification and granularity", "description": "Where a 3-note chord sits among kinds, and how finely a task needs to cut it.", "findings": [ { "id": "kind-and-parents", "name": "Kind, parents and neighbouring kinds", "description": "The classes this thing belongs to and the ones it is next to.", "questions": [ { "id": "kind-and-parents-q01", "text": "What identifies and describes the kind of a 3-note chord, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "kind-and-parents-q02", "text": "Who or what asserted this about the kind of a 3-note chord, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "kind-and-parents-q03", "text": "What may an agent decide or do once the kind of a 3-note chord is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] }, { "id": "distinguishing-features", "name": "Distinguishing features", "description": "What separates a 3-note chord from the things most often confused with it.", "questions": [ { "id": "distinguishing-features-q01", "text": "What identifies and describes what distinguishes a 3-note chord, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "distinguishing-features-q02", "text": "Who or what asserted this about what distinguishes a 3-note chord, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "distinguishing-features-q03", "text": "What may an agent decide or do once what distinguishes a 3-note chord is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] } ] }, { "id": "state-and-lifecycle", "name": "State and lifecycle", "description": "The states a 3-note chord passes through and the events that move it between them.", "rationale": "Most decisions about a thing depend on what state it is in now, which is a claim with a time on it, not a property.", "layers": [ { "id": "lifecycle-stages", "name": "Lifecycle stages", "description": "From coming into existence to ceasing to be one of these.", "findings": [ { "id": "stages-and-transitions", "name": "Stages and transitions", "description": "The stages worth naming and what moves a 3-note chord between them.", "questions": [ { "id": "stages-and-transitions-q01", "text": "What identifies and describes the lifecycle of a 3-note chord, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "stages-and-transitions-q02", "text": "Who or what asserted this about the lifecycle of a 3-note chord, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "stages-and-transitions-q03", "text": "What may an agent decide or do once the lifecycle of a 3-note chord is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] }, { "id": "observations-and-status", "name": "Observations and current status", "description": "What is observed about a 3-note chord, how often and by whom.", "findings": [ { "id": "observation-record", "name": "Observation record", "description": "How an observation of a 3-note chord is recorded so that it can be superseded rather than overwritten.", "questions": [ { "id": "observation-record-q01", "text": "What identifies and describes an observation of a 3-note chord, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "observation-record-q02", "text": "Who or what asserted this about an observation of a 3-note chord, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "observation-record-q03", "text": "What may an agent decide or do once an observation of a 3-note chord is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] } ] }, { "id": "definitions-in-contest", "name": "Definitions and who holds them", "description": "What 3-note chord is taken to mean, and by whom.", "rationale": "When a field disagrees about a concept, the disagreement is the content. A model that picks one definition silently destroys the information.", "layers": [ { "id": "competing-definitions", "name": "Competing definitions", "description": "The main readings and the traditions behind them.", "findings": [ { "id": "definition-map", "name": "Definitions and their holders", "description": "Each definition with the school or body that holds it.", "questions": [ { "id": "definition-map-q01", "text": "Which definitions of 3-note chord are in use, and which tradition or body holds each?", "kind": "definition" }, { "id": "definition-map-q02", "text": "What turns on the difference between them in practice?", "kind": "boundary" } ] } ] }, { "id": "operationalisation", "name": "Operationalisation", "description": "How it is measured or applied when it has to be.", "findings": [ { "id": "operational-record", "name": "Measures and proxies", "description": "Instruments and indicators used to stand in for it.", "questions": [ { "id": "operational-record-q01", "text": "How is 3-note chord operationalised or measured in practice, and by what instrument?", "kind": "measurement" }, { "id": "operational-record-q02", "text": "What does that operationalisation leave out, and when does that matter?", "kind": "boundary" } ] } ] } ] }, { "id": "instances-and-use", "name": "Instances, use and consequence", "description": "What counts as an instance of 3-note chord and what follows from calling something that.", "rationale": "Applying a concept is an act with consequences, so a model must say what the label licenses and what it does not.", "layers": [ { "id": "instances", "name": "What counts as an instance", "description": "Clear cases, borderline cases and non-cases.", "findings": [ { "id": "instance-tests", "name": "Tests for an instance", "description": "What would settle whether something falls under it.", "questions": [ { "id": "instance-tests-q01", "text": "What would settle whether something is an instance of 3-note chord?", "kind": "boundary" }, { "id": "instance-tests-q02", "text": "Which borderline cases are argued about, and on what grounds?", "kind": "definition" } ] } ] }, { "id": "consequence", "name": "Consequence of application", "description": "Rights, duties or decisions that follow from the label.", "findings": [ { "id": "consequence-record", "name": "What the label licenses", "description": "What an agent may do once something is classified this way.", "questions": [ { "id": "consequence-record-q01", "text": "What follows practically once something is treated as 3-note chord?", "kind": "action" }, { "id": "consequence-record-q02", "text": "What must an agent not infer from the label alone?", "kind": "action" } ] } ] } ] }, { "id": "provenance-and-evidence", "name": "Provenance, evidence and time", "description": "Where every claim about a 3-note chord came from and when it held.", "rationale": "A claim without a source and a time cannot be superseded, only overwritten, and an agent that overwrites loses the ability to explain itself.", "layers": [ { "id": "source-and-authority", "name": "Source and authority", "description": "Who said it, on what evidence, and how strongly.", "findings": [ { "id": "claim-provenance", "name": "Claim provenance and confidence", "description": "The authority behind each claim about a 3-note chord and how confident it is.", "questions": [ { "id": "claim-provenance-q01", "text": "What identifies and describes a claim about a 3-note chord, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "claim-provenance-q02", "text": "Who or what asserted this about a claim about a 3-note chord, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "claim-provenance-q03", "text": "What may an agent decide or do once a claim about a 3-note chord is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] }, { "id": "time-and-versions", "name": "Time, versions and supersession", "description": "When a claim was true, when it was learnt, and what replaced it.", "findings": [ { "id": "validity-and-supersession", "name": "Validity period and supersession", "description": "How an old claim about a 3-note chord is retired without being erased.", "questions": [ { "id": "validity-and-supersession-q01", "text": "What identifies and describes the validity of a claim about a 3-note chord, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "validity-and-supersession-q02", "text": "Who or what asserted this about the validity of a claim about a 3-note chord, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "validity-and-supersession-q03", "text": "What may an agent decide or do once the validity of a claim about a 3-note chord is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] } ] } ] }, "statistics": { "bundles": 5, "layers": 10, "findings": 12, "questions": 32 } } } }