{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.harpsichord","code":"thing-q81982","url":"https://ver.cy/models/thing/q81982/","name":"harpsichord","alternateNames":["Musikhaus Kurt Sperrhake","pedal harpsichord","Spinettone","clavicytherium","ottavino","spinet","octave spinet","oval spinet"],"kind":"thing","status":"published","version":"0.1.0-research.1","language":"en","classifiers":{"family":"Thing Registry","category":"Physical world and living systems","entryKind":"thing","plane":"PHY","domain":["PHY.OBJ"],"industry":[],"navPath":"","tags":[],"facets":{}},"whatItIs":"A harpsichord is a plucked-string keyboard chordophone whose action lifts a jack so that a plectrum (historically quill or leather) plucks an individual taut string and a damper silences it on key release, producing a plucked timbre whose loudness is essentially independent of key velocity; its case need not be wing-shaped.","purpose":"Enable an AI agent to recognise a harpsichord, assess its musical and material readiness, and determine which playing, adjustment, maintenance or conservation actions are appropriate.","scope":{"in":["Keyboard-operated plucking mechanism, including keys, jacks, plectra, tongues and dampers","Manuals, string choirs, registers, couplers and playable compass","Strings, bridges, soundboard, case and their functional relationships","Tuning configuration, note response and musical readiness","Alterations, component originality and constraints on playing or intervention"],"out":["Performer technique, competence and physical condition","Musical compositions, editions and performance interpretations","Room acoustics and building climate systems","Workshop tools and inventories of uninstalled replacement parts","Ownership transactions, insurance contracts and institutional collection policy"],"boundaries":[]},"distinguishingFeatures":["Observe whether a key raises a jack whose plectrum plucks a string; a hammer striking the string instead indicates a different keyboard mechanism.","Check whether a tangent strikes and remains against the string while the key is held, which distinguishes a clavichord mechanism from a harpsichord action.","Confirm that keys operate the plucking mechanism directly through the action rather than selecting electronically generated or sampled sounds.","Record case form, string orientation and string arrangement before distinguishing a harpsichord from a spinet or virginal; those names alone do not settle this registry entry's boundary."],"structure":{"bundles":[{"id":"instrument-identity-and-history","name":"Instrument identity and history","description":"Establishes why this instrument belongs to the harpsichord entry and which construction history its present form represents.","layers":[{"id":"mechanism-and-family-boundary","name":"Mechanism and family boundary","description":"Tests the sound-producing mechanism and records features needed to resolve neighbouring instrument classifications.","findings":[{"id":"observed-plucked-keyboard-identity","name":"Observed plucked keyboard identity","description":"Records observed evidence for classification without treating appearance or a supplied name as conclusive.","questions":[{"text":"Does pressing a key raise a jack whose plectrum plucks a string, and which parts of that sequence were directly observed?","id":"observed-plucked-keyboard-identity-q01","kind":"definition"},{"text":"Do the case form and string arrangement place this instrument within this registry entry or require a boundary decision concerning a spinet or virginal?","id":"observed-plucked-keyboard-identity-q02","kind":"boundary"}]}]},{"id":"construction-and-alteration-history","name":"Construction and alteration history","description":"Separates supported maker or model attribution from later changes to the instrument.","findings":[{"id":"supported-attribution-and-component-history","name":"Supported attribution and component history","description":"Connects identity claims and consequential alterations to inspectable evidence.","questions":[{"text":"Which inscriptions, records or examinations support the maker, date and any claimed historical prototype?","id":"supported-attribution-and-component-history-q01","kind":"provenance"},{"text":"Which changes to the compass, manuals, stringing or action are documented, and which remain suspected?","id":"supported-attribution-and-component-history-q02","kind":"provenance"}]}]}]},{"id":"keyboard-and-registration","name":"Keyboard and registration","description":"Describes how the player selects notes and combinations of sounding strings.","layers":[{"id":"manuals-and-note-mapping","name":"Manuals and note mapping","description":"Maps each keyboard to its actual sounding notes and identifies exceptional layouts.","findings":[{"id":"verified-playing-compass","name":"Verified playing compass","description":"Records the usable note range and departures from an assumed consecutive chromatic layout.","questions":[{"text":"What are the key count and lowest and highest sounding notes of each manual?","id":"verified-playing-compass-q01","kind":"measurement"},{"text":"Are short-octave arrangements, split keys or transposition facilities present, and how do they change the key-to-note mapping?","id":"verified-playing-compass-q02","kind":"definition"}]}]},{"id":"choirs-stops-and-coupling","name":"Choirs, stops and coupling","description":"Relates register controls to jack rows, string choirs and connections between manuals.","findings":[{"id":"available-registration-paths","name":"Available registration paths","description":"Distinguishes the intended disposition from combinations that currently function.","questions":[{"text":"Which string choirs does each manual activate through each jack row, and what pitch relationship does each choir have to the played key?","id":"available-registration-paths-q01","kind":"definition"},{"text":"Which stops, couplers and buff effects, if present, operate correctly, and what procedure or restriction governs changing them?","id":"available-registration-paths-q02","kind":"action"}]}]}]},{"id":"plucking-action-and-voicing","name":"Plucking action and voicing","description":"Assesses the mechanical sequence that produces, repeats and stops each note.","layers":[{"id":"key-jack-and-plectrum-response","name":"Key, jack and plectrum response","description":"Examines the movement and plucking behaviour of the action by key and register.","findings":[{"id":"reliable-pluck-and-return","name":"Reliable pluck and return","description":"Locates irregularities in key travel, jack movement, plectrum engagement and tongue return.","questions":[{"text":"For each tested register, which keys miss, stick, double-pluck or fail to repeat, and under what playing conditions?","id":"reliable-pluck-and-return-q01","kind":"measurement"},{"text":"What plectrum materials and visible conditions are present, and which observations justify specialist regulation or voicing?","id":"reliable-pluck-and-return-q02","kind":"action"}]}]},{"id":"damping-and-note-consistency","name":"Damping and note consistency","description":"Evaluates note release and uneven response without assuming every tonal difference is a defect.","findings":[{"id":"controlled-release-and-voicing-assessment","name":"Controlled release and voicing assessment","description":"Records ineffective damping and tonal or touch differences against an explicit assessment target.","questions":[{"text":"Which strings continue sounding after key release when they should be damped, and is the behaviour tied to a particular registration?","id":"controlled-release-and-voicing-assessment-q01","kind":"measurement"},{"text":"Which differences in attack, loudness or touch are judged unintended, and what documented voicing aim supports that judgment?","id":"controlled-release-and-voicing-assessment-q02","kind":"boundary"}]}]}]},{"id":"stringing-tuning-and-resonance","name":"Stringing, tuning and resonance","description":"Connects string specifications and tuning choices to the instrument's observed acoustic performance.","layers":[{"id":"string-scaling-and-replacement","name":"String scaling and replacement","description":"Records installed string specifications and the evidence needed for compatible replacement.","findings":[{"id":"documented-stringing-basis","name":"Documented stringing basis","description":"Links notes and choirs to string dimensions, materials, condition and replacement evidence.","questions":[{"text":"What speaking lengths, diameters and identified materials are recorded for each choir and relevant note range?","id":"documented-stringing-basis-q01","kind":"measurement"},{"text":"What maker documentation, stringing schedule or specialist assessment supports replacing a missing or damaged string?","id":"documented-stringing-basis-q02","kind":"provenance"}]}]},{"id":"pitch-temperament-and-acoustic-response","name":"Pitch, temperament and acoustic response","description":"Separates tuning configuration from drift and from faults in resonance or string termination.","findings":[{"id":"established-tuning-and-sounding-condition","name":"Established tuning and sounding condition","description":"Records the current tuning basis and note-specific acoustic anomalies.","questions":[{"text":"What reference pitch and temperament are established, and how far do measured notes depart from that target under recorded conditions?","id":"established-tuning-and-sounding-condition-q01","kind":"measurement"},{"text":"Which notes exhibit buzzing, unusually short sustain or unstable pitch, and what observations help locate the cause?","id":"established-tuning-and-sounding-condition-q02","kind":"measurement"},{"text":"What instrument-specific evidence permits the proposed pitch change or tuning operation?","id":"established-tuning-and-sounding-condition-q03","kind":"action"}]}]}]},{"id":"structural-condition-and-use-constraints","name":"Structural condition and use constraints","description":"Determines how material condition and conservation commitments constrain use of the strung instrument.","layers":[{"id":"tension-bearing-and-resonant-structure","name":"Tension-bearing and resonant structure","description":"Assesses the case, pin-bearing areas, bridges and soundboard in relation to string tension and sounding function.","findings":[{"id":"located-damage-and-stability-evidence","name":"Located damage and stability evidence","description":"Distinguishes visible damage from demonstrated movement or loss of structural function.","questions":[{"text":"Where are cracks, deformation, loose joints or bridge and pin movement recorded, and what dated observations establish whether they are changing?","id":"located-damage-and-stability-evidence-q01","kind":"measurement"},{"text":"Which findings require specialist assessment before tuning or playing, and what evidence would resolve the restriction?","id":"located-damage-and-stability-evidence-q02","kind":"action"}]}]},{"id":"playing-care-and-conservation-decisions","name":"Playing, care and conservation decisions","description":"Connects intended use with handling instructions, environmental evidence and limits on intervention.","findings":[{"id":"supported-use-and-intervention-envelope","name":"Supported use and intervention envelope","description":"Records which operations are appropriate for this instrument and the evidence and authority supporting them.","questions":[{"text":"What maker or conservator guidance governs acclimatisation, support, lifting and transport, and do current conditions satisfy it?","id":"supported-use-and-intervention-envelope-q01","kind":"action"},{"text":"Which tuning, voicing, string replacement or structural interventions are permitted, by whom, and with what requirements to retain or document historic material?","id":"supported-use-and-intervention-envelope-q02","kind":"action"}]}]}]},{"id":"evidence-and-external-alignment","name":"Evidence and external alignment","description":"What the world already says about this thing, gathered so the model can be checked against it.","layers":[{"id":"reported-evidence","name":"Reported evidence","description":"Findings from the breadth pass, kept separate from the structural claims.","findings":[{"id":"evidence-kinds","name":"Kinds and varieties","description":"Reported by the breadth pass; each item needs checking against its source before it becomes normative.","questions":[{"text":"Which of these kinds and varieties hold for the sense of harpsichord this model covers, and on what evidence?","id":"evidence-kinds-q01","kind":"provenance"}]},{"id":"evidence-identifiers","name":"Identifiers and schemes","description":"Reported by the breadth pass; each item needs checking against its source before it becomes normative.","questions":[{"text":"Which of these identifiers and schemes hold for the sense of harpsichord this model covers, and on what evidence?","id":"evidence-identifiers-q01","kind":"provenance"}]},{"id":"evidence-standards-and-regulation","name":"Standards and regulation","description":"Reported by the breadth pass; each item needs checking against its source before it becomes normative.","questions":[{"text":"Which of these standards and regulation hold for the sense of harpsichord this model covers, and on what evidence?","id":"evidence-standards-and-regulation-q01","kind":"provenance"}]},{"id":"evidence-real-world-use","name":"Real-world use","description":"Reported by the breadth pass; each item needs checking against its source before it becomes normative.","questions":[{"text":"Which of these real-world use hold for the sense of harpsichord this model covers, and on what evidence?","id":"evidence-real-world-use-q01","kind":"provenance"}]},{"id":"evidence-measurements","name":"Typical measurements","description":"Reported by the breadth pass; each item needs checking against its source before it becomes normative.","questions":[{"text":"Which of these typical measurements hold for the sense of harpsichord this model covers, and on what evidence?","id":"evidence-measurements-q01","kind":"provenance"}]},{"id":"evidence-failure-modes-and-hazards","name":"Failure modes and hazards","description":"Reported by the breadth pass; each item needs checking against its source before it becomes normative.","questions":[{"text":"Which of these failure modes and hazards hold for the sense of harpsichord this model covers, and on what evidence?","id":"evidence-failure-modes-and-hazards-q01","kind":"provenance"}]},{"id":"evidence-regional-variation","name":"Regional variation","description":"Reported by the breadth pass; each item needs checking against its source before it becomes normative.","questions":[{"text":"Which of these regional variation hold for the sense of harpsichord this model covers, and on what evidence?","id":"evidence-regional-variation-q01","kind":"provenance"}]},{"id":"evidence-neighbours","name":"Neighbouring kinds and how to tell them apart","description":"Reported by the breadth pass; each item needs checking against its source before it becomes normative.","questions":[{"text":"Which of these neighbouring kinds and how to tell them apart hold for the sense of harpsichord this model covers, and on what evidence?","id":"evidence-neighbours-q01","kind":"provenance"}]}]}]}]},"agentConduct":{"may":["Monitor room temperature and humidity around a harpsichord and alert its keeper.","Describe its type, maker and history from documentation and labels."],"mustNot":["Retune, revoice or regulate a harpsichord without the owner's or technician's instruction.","Move a harpsichord without proper support for its long, fragile case.","Alter, restore or replace original parts of a historical instrument without the owner's decision.","Misattribute an instrument to a maker or date to raise its value."],"requiresHuman":["Restoration or conservation of a historical instrument.","Selling or lending it."]},"ethics":{"considerations":["Surviving historical harpsichords are irreplaceable cultural heritage.","Honest attribution protects buyers and the historical record."],"affectedParties":["Owners and collections","Musicians","Future players and listeners"]},"owners":{"steward":"The person or collection that owns it; museums hold historical examples.","roles":[],"masterSystems":["Museum collection catalogues"]},"relations":[{"target":"Q230262","type":"parent","note":"registry parent class"},{"target":"Q4951628","type":"parent","note":"registry parent class"},{"target":"Q52954","type":"parent","note":"registry parent class"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.harpsichord","Wikidata: Q81982 (https://www.wikidata.org/wiki/Q81982)"]},"properties":{"applicability":"required","items":["Sound-production mechanism: Jack-and-plectrum string plucking; other; unresolved","Keyboard compass: Lowest and highest sounding notes, key count and exceptional key-to-note mappings, recorded per manual","Manual and register disposition: Mapping of manuals, jack rows, string choirs, stops and couplers, including nominal pitch designation where established","Action response: Per key and register: plucks, misses, repeats reliably, sticks, double-plucks or remains untested","Plectrum material: Identified material, mixed materials or unknown, recorded by jack or jack row","Reference pitch: Hz at a named reference note, with measurement date and conditions","Temperament: Documented temperament or measured interval pattern; unknown","String specification: Speaking length and diameter in mm, linked to note, choir and identified material","Structural condition under tension: Located observations of cracks, deformation, loose joints and bridge or pin movement; stability established, unresolved or unassessed","Component history: Components linked to evidence of manufacture, replacement, alteration or restoration"]},"recognition":{"applicability":"required","items":["A wing-shaped case like a grand piano is common, often with a decorated lid and soundboard, but other case forms occur.","One or two keyboards are common, sometimes with coloured or reversed key colours.","Strings are plucked rather than struck, giving a bright sound with little loudness control."]},"capabilities":{"applicability":"required","items":["Identify the instrument through its keyboard, plucking action and string arrangement.","Determine playable compass and available registrations for a proposed musical use.","Conduct an authorised note-by-note response and damping assessment when condition permits.","Measure tuning and compare the current configuration with a documented target.","Locate action, stringing or structural problems and route them to an appropriately qualified specialist.","Determine whether playing, tuning, voicing, restringing or moving can proceed under documented constraints."]},"hazards":{"applicability":"required","items":["Cracks in soundboard or case from dry or fluctuating air.","Finger injury from a falling lid."]},"interfaces":{"applicability":"required","items":["The Harmonized System issued by the World Customs Organization includes harpsichords under heading 9201 for customs classification."]},"context":{"applicability":"required","items":["Harpsichords are used in early music performance, ensemble accompaniment and keyboard teaching.","They are also encountered in instrument collections and conservation workshops, where their actions, strings and cases require assessment."]}},"sources":[{"title":"A History of the Harpsichord - Edward L. Kottick, Indiana University Press (2003)","url":"","note":"National schools, compass and disposition practice, clavicytherium and pedal instruments, and the 20th-century revival versus historically informed copies."},{"title":"Three Centuries of Harpsichord Making - Frank Hubbard, Harvard University Press (1965)","url":"","note":"Construction, scaling, jack action, and the Italian, Flemish, French, English and German making traditions."},{"title":"Harpsichord - The New Grove Dictionary of Music and Musicians / Grove Music Online, Oxford University Press","url":"","note":"Organological definition, family relationship to virginal and spinet, historical pitch and use in continuo and solo repertory."},{"title":"Systematik der Musikinstrumente - Erich M. von Hornbostel and Curt Sachs, Zeitschrift für Ethnologie (1914), as used in later MIMO revisions","url":"","note":"Taxonomic identifier 314.122-6-8 for keyboard board zithers sounded by plectrum."},{"title":"Wikidata item Q81982: harpsichord","url":"https://www.wikidata.org/wiki/Q81982","note":"identity and sense of the item"},{"title":"Wikipedia: Harpsichord","url":"https://en.wikipedia.org/wiki/Harpsichord","note":"general description of the item"}],"openQuestions":["Does the authoritative registry include spinets, virginals and other related plucked keyboard forms within harpsichord, or assign them to neighbouring entries?","Does an existing Vercy world model already cover this concept and therefore need to be linked instead of duplicated?","What evidence and terminology should distinguish original instruments, historical copies, reconstructions and later conversions?","Which assessment methods can establish acceptable action response and voicing without imposing one instrument tradition's preferences on another?","What instrument-specific sources should govern pitch limits, environmental conditions and decisions to restrict playing or intervention?"],"resources":{"spec":"/models/things/publications/thing-q81982/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q81982/spec.json"],"providers":["Codex","Grok"],"researchStatus":"unreviewed","generatedAt":"2026-09-07T14:18:34Z","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":"filled","interaction.recognition":"filled","interaction.capabilities":"filled","interaction.hazards":"filled","interaction.interfaces":"filled","interaction.context":"filled","sources":"filled"},"notes":{"_gate":"Published through the thing publication gate 1.0 on 2026-10-07T12:16:34+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass"},"score":1.0}}