{ "model": { "rank": 15775, "code": "thing-q224169", "model_id": "vr.tr.fifth", "name": "fifth", "purpose": "Let an agent handle the musical fifth by type, sound, notation, tuning and use in harmony, and separate other senses of fifth.", "family": "Thing Registry", "category": "Cross-cutting context", "status": "research-draft", "kind": "thing", "plane": "XCT", "domain": "XCT.QTY", "industry": "", "version": "", "url": "/models/thing/q224169/", "tier": 2, "score": 33, "payload": { "layer": "wikidata", "aliases": [ "perfect fifth", "diminished fifth", "minor fifth", "augmented fifth" ], "aliasCount": 4, "merged": 4, "knownIn": 33, "facets": null, "markers": [], "lexicalClass": "", "senseRank": null, "alsoRegisteredAs": "vr.tr.fifth-communication", "source": { "dataset": "wikidata", "item": "Q224169", "url": "https://www.wikidata.org/wiki/Q224169", "license": "CC0 1.0" } }, "research": { "vercy": "1.0-draft", "publication": { "status": "research-draft", "adjudicationStatus": "unreviewed", "publishableCanonical": false, "generatedAt": "2026-09-11T10:18:59Z", "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" }, "metaModel": { "id": "THING-Q224169", "registryId": "vr.tr.fifth", "name": "fifth", "version": "0.2.0-wave.1", "entryKind": "thing", "family": "Thing Registry", "domain": [ "XCT.QTY" ], "status": "research-draft" }, "canonicalUrl": "https://ver.cy/models/thing/q224169/", "model": { "registry_id": "vr.tr.fifth", "name": "fifth", "purpose": "Let an agent handle the musical fifth by type, sound, notation, tuning and use in harmony, and separate other senses of fifth.", "definition": "In music, the interval spanning five diatonic scale degrees; the perfect fifth (seven semitones, frequency ratio about 3:2) is fundamental to harmony and tuning, with diminished and augmented fifths as variants.", "what_it_is_for": "Harmony, tuning and composition.", "affordances": [ "identify and name fifths", "tune instruments by fifths", "explain the circle of fifths", "recognise fifths by ear" ], "distinguishing_features": [ "Five scale degrees apart", "Perfect fifth is very consonant", "Basis of the circle of fifths", "Used in tuning string instruments" ], "appearance": "Heard as a stable, open sound; written as notes five letter names apart.", "visual_identification": [ "Seven semitones for a perfect fifth", "Circle of fifths diagrams", "Fifth as an ordinal or a fraction is a different sense" ], "physical_properties": [ { "quantity": "perfect fifth ratio", "typical_range": "about 3:2", "unit": "", "note": "just intonation" }, { "quantity": "equal-tempered perfect fifth", "typical_range": "700", "unit": "cents", "note": "" } ], "families_and_kinds": [ "perfect fifth", "diminished fifth", "augmented fifth", "power chords (related)" ], "related_models": [ { "relation": "is a kind of", "target": "interval", "why": "category" }, { "relation": "is used in", "target": "harmony and tuning", "why": "practice" }, { "relation": "is related to", "target": "circle of fifths", "why": "tool" }, { "relation": "is confused with", "target": "fifth (ordinal)", "why": "another sense" } ], "identifiers": [], "standards_and_regulation": [], "failure_modes_and_hazards": [ "Confusing interval quality", "Confusing senses" ], "in_scope": [], "out_of_scope": [], "characteristics": [] }, "sources": [], "structure": { "bundles": [ { "id": "interval", "name": "Interval", "description": "Which fifth.", "rationale": "Quality matters.", "layers": [ { "id": "quality", "name": "Quality", "description": "Perfect, diminished.", "findings": [ { "id": "quality-finding", "name": "Quality", "description": "Interval quality.", "questions": [ { "text": "Is it a perfect, diminished or augmented fifth?", "kind": "definition" }, { "text": "How many semitones?", "kind": "measurement" } ] } ] }, { "id": "notation", "name": "Notation", "description": "Notes.", "findings": [ { "id": "notation-finding", "name": "Notation", "description": "Notation.", "questions": [ { "text": "Which notes form this fifth?", "kind": "definition" }, { "text": "How is it spelled correctly?", "kind": "definition" } ] } ] } ] }, { "id": "harmony", "name": "Harmony", "description": "Use.", "rationale": "Fifths structure harmony.", "layers": [ { "id": "circle", "name": "Circle", "description": "Circle of fifths.", "findings": [ { "id": "circle-finding", "name": "Circle", "description": "Circle of fifths.", "questions": [ { "text": "How does the circle of fifths relate keys?", "kind": "definition" }, { "text": "How is it used in composition?", "kind": "action" } ] } ] }, { "id": "voice-leading", "name": "Voice leading", "description": "Parallel fifths.", "findings": [ { "id": "voice-leading-finding", "name": "Voice leading", "description": "Voice leading.", "questions": [ { "text": "Why are parallel fifths avoided in some styles?", "kind": "definition" }, { "text": "In which styles are they used freely?", "kind": "provenance" } ] } ] } ] }, { "id": "tuning", "name": "Tuning", "description": "Instruments.", "rationale": "Tuning uses fifths.", "layers": [ { "id": "instruments", "name": "Instruments", "description": "Strings.", "findings": [ { "id": "instruments-finding", "name": "Instruments", "description": "Tuning instruments.", "questions": [ { "text": "How are instruments such as the violin tuned in fifths?", "kind": "action" }, { "text": "Which reference pitch is used?", "kind": "provenance" } ] } ] }, { "id": "temperament", "name": "Temperament", "description": "Systems.", "findings": [ { "id": "temperament-finding", "name": "Temperament", "description": "Temperament.", "questions": [ { "text": "How does the fifth differ between just and equal temperament?", "kind": "measurement" }, { "text": "Why does it matter?", "kind": "definition" } ] } ] } ] }, { "id": "learning", "name": "Learning", "description": "Ear training.", "rationale": "Ears can be trained.", "layers": [ { "id": "ear", "name": "Ear", "description": "Recognition.", "findings": [ { "id": "ear-finding", "name": "Ear", "description": "Ear training.", "questions": [ { "text": "How can the fifth be recognised by ear?", "kind": "action" }, { "text": "Which reference songs help?", "kind": "provenance" } ] } ] }, { "id": "senses", "name": "Senses", "description": "Disambiguation.", "findings": [ { "id": "senses-finding", "name": "Senses", "description": "Other senses.", "questions": [ { "text": "Is fifth as an ordinal, fraction or bottle size meant?", "kind": "boundary" }, { "text": "Which entry fits?", "kind": "action" } ] } ] } ] } ] }, "openQuestions": [ "Should each fifth type be a separate entry?", "How should tuning systems be linked?", "How should other senses be split off?" ], "statistics": { "bundles": 4, "layers": 8, "findings": 8, "questions": 16 } }, "draft": { "generator": "vr.draft.v3", "status": "draft-generated", "researched": false, "archetype": "unit, quantity or measure", "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 fifth, record what state it is in, and decide what may be done with it.", "whatItIs": "Let an agent handle the musical fifth by type, sound, notation, tuning and use in harmony, and separate other senses of fifth.", "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: perfect fifth, diminished fifth, minor fifth, augmented fifth.", "4 finer distinctions are held as aliases rather than separate entries, because telling them apart needs a task that asks for it.", "Described in 33 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 fifth, 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: a unit is a convention. What is seen is an instrument reading in it." ], "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": [ "perfect fifth", "diminished fifth", "minor fifth", "augmented fifth" ] } ], "standing": "Described in 33 Wikipedia languages, which measures how widely it is written about rather than how important or how common it is. 4 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 fifth from another, and a fifth 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 fifth, 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 fifth, 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 fifth 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 fifth, 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 fifth, 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 fifth 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 fifth 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 fifth, 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 fifth, 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 fifth 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 fifth from the things most often confused with it.", "questions": [ { "id": "distinguishing-features-q01", "text": "What identifies and describes what distinguishes a fifth, 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 fifth, 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 fifth 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 fifth 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 fifth between them.", "questions": [ { "id": "stages-and-transitions-q01", "text": "What identifies and describes the lifecycle of a fifth, 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 fifth, 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 fifth 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 fifth, how often and by whom.", "findings": [ { "id": "observation-record", "name": "Observation record", "description": "How an observation of a fifth 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 fifth, 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 fifth, 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 fifth is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] } ] }, { "id": "definition-and-realisation", "name": "Definition, dimension and realisation", "description": "What fifth is defined as and how it is realised in practice.", "rationale": "A unit is not the quantity it measures, and its definition has a history that older data still depends on.", "layers": [ { "id": "definition", "name": "Definition and dimension", "description": "The defining relation and the quantity it measures.", "findings": [ { "id": "definition-record", "name": "Definition, body and date", "description": "What defines it now, and what defined it before.", "questions": [ { "id": "definition-record-q01", "text": "How is fifth defined, by which body, and since when?", "kind": "definition" }, { "id": "definition-record-q02", "text": "What was the previous definition, and what data still depends on it?", "kind": "provenance" } ] } ] }, { "id": "conversion", "name": "Conversion and compatibility", "description": "Relations to other units, exact or approximate.", "findings": [ { "id": "conversion-record", "name": "Conversions and their exactness", "description": "Factors, and whether each is exact by definition.", "questions": [ { "id": "conversion-record-q01", "text": "What conversions relate fifth to other units, and which are exact by definition?", "kind": "measurement" }, { "id": "conversion-record-q02", "text": "Where does rounding a conversion change a decision, and how should that be recorded?", "kind": "action" } ] } ] } ] }, { "id": "provenance-and-evidence", "name": "Provenance, evidence and time", "description": "Where every claim about a fifth 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 fifth and how confident it is.", "questions": [ { "id": "claim-provenance-q01", "text": "What identifies and describes a claim about a fifth, 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 fifth, 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 fifth 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 fifth is retired without being erased.", "questions": [ { "id": "validity-and-supersession-q01", "text": "What identifies and describes the validity of a claim about a fifth, 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 fifth, 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 fifth is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] } ] } ] }, "statistics": { "bundles": 4, "layers": 8, "findings": 10, "questions": 28 } } } }