viola
Enable an AI agent to recognise a viola, assess its playing condition and suitability, and decide which uses, adjustments or specialist interventions are appropriate.
Bundle → Layer → Finding → Questions Filled
6 bundles · 11 layers · 18 findings · 28 questions
Viola identity Establishes why this instrument belongs to the viola entry and which variant it represents.
Instrument boundary
Tests the interpretation of viola against neighbouring instrument types.
Viola identification basis
Records supporting observations and unresolved conflicts without treating any single feature as decisive.
- What construction, intended register, playing position and documentation support identifying this instrument as a viola? definition
- What evidence distinguishes it from a violin, cello, viol or instrument converted to another role? boundary
Variant and attribution
Separates present configuration from claims about manufacture and earlier forms.
Documented viola variant
Captures acoustic or electric form, string-count variants and evidence behind maker or conversion claims.
- Which viola variant describes its present construction and intended use, and which features depart from that description? definition
- What records or inspections support its maker, date and any conversion history, beyond an internal label alone? provenance
Body scale and player fit Connects the viola's physical dimensions with reach, support and practical handling.
Body and string scale
Records dimensions that distinguish the body envelope from the playing length.
Measured viola geometry
Retains measurement methods so body length, neck geometry and string length can be compared reliably.
- What are the body length, bout widths, rib depth and vibrating string length, and how was each measured? measurement
- Does any stated size designation accurately describe these measurements, or conceal an unusual body or neck configuration? boundary
Playing reach and support
Assesses this viola in relation to an identified player and fitted supports.
Player-fit trial
Records observed reach and support limitations without inferring suitability from dimensions alone.
- With the recorded chinrest and shoulder-support arrangement, can the intended player reach the required positions and bow each string comfortably? measurement
- Which support changes or further supervised trials are justified before accepting or rejecting this viola for that player? action
Strings and playing setup Describes the installed string system and the geometry through which it is played.
Stringing and tuning
Documents the actual strings and intended pitches, including variant tunings.
Compatible string system
Connects installed strings with the instrument's scale, tuning and attachment hardware.
- What strings are installed, in what order and tuning, and what evidence establishes their compatibility with this viola's vibrating string length? definition
- Which documented string replacements or tuning changes are suitable, and which require specialist assessment? action
Bridge, fingerboard and tuning hardware
Examines the contact geometry and hardware governing stopping, bow clearance and tuning.
Functional setup geometry
Records action, spacing, bridge condition and tuning operation as an interacting setup.
- What are the measured string clearances and spacings, and what bridge or fingerboard observations explain restricted bow access or unwanted string contact? measurement
- Do the pegs and fine tuners operate reliably, and which observed setup problems require a luthier's intervention? action
Structural condition and intervention Assesses the viola's load-bearing assembly and the implications of damage or earlier repairs.
Body, neck and internal support
Locates damage and uncertainty in the body, neck joint and applicable internal components.
Structural condition evidence
Distinguishes visible observations from specialist conclusions and inaccessible areas.
- Where are cracks, open seams, deformation or joint movement observed, and which areas remain uninspected? measurement
- For this construction, what inspection evidence exists for the soundpost, bass bar or other internal supports, where present? provenance
Repair and use limits
Connects repair history and current findings with permissible handling and intervention.
Condition-dependent actions
Records supported decisions about playing, maintenance and referral without assuming that old repairs are either sound or defective.
- Which repairs or alterations are documented, and what evidence establishes their present stability? provenance
- Given the observed condition, may playing continue, what handling limits apply, and what must a specialist assess before adjustment? action
Sound response and readiness Determines whether this viola delivers usable response in its intended playing configuration.
Bowed response
Captures repeatable response observations across strings, positions and dynamics.
Response test evidence
Associates tonal or mechanical symptoms with notes and controlled trial conditions.
- Under which player, bow, tuning and room conditions were response, balance, buzzes or unstable notes assessed? provenance
- On which strings, pitches, positions and dynamics are problems repeatable, and what comparisons help separate instrument effects from trial conditions? measurement
Configuration-specific readiness
Combines response evidence with the requirements of acoustic or amplified use.
Intended-use readiness
Records readiness for a specified use, including applicable onboard electronics and unresolved limitations.
- For an electric or electro-acoustic viola, do the fitted pickup, output and onboard controls function with the documented test equipment? measurement
- For the intended rehearsal, performance or practice use, is this viola ready, conditionally usable or awaiting intervention, and what evidence supports that decision? action
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Kinds and varieties
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Which of these kinds and varieties hold for the sense of viola this model covers, and on what evidence? provenance
Identifiers and schemes
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Which of these identifiers and schemes hold for the sense of viola this model covers, and on what evidence? provenance
Standards and regulation
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Which of these standards and regulation hold for the sense of viola this model covers, and on what evidence? provenance
Real-world use
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Which of these real-world use hold for the sense of viola this model covers, and on what evidence? provenance
Typical measurements
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Which of these typical measurements hold for the sense of viola this model covers, and on what evidence? provenance
Failure modes and hazards
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Which of these failure modes and hazards hold for the sense of viola this model covers, and on what evidence? provenance
Regional variation
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Which of these regional variation hold for the sense of viola this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of viola this model covers, and on what evidence? provenance
Classifiers Filled
- Family
- Thing Registry
- Category
- Physical world and living systems
- Entry kind
- thing
- Plane
- PHY
- Domain
- PHY.OBJ
- Other names and narrower kinds
- electric viola, viola (arc), viola (fingered)
What it is Filled
A bowed, unfretted, four-string necked-box lute of the violin family, tuned in fifths to C3-G3-D4-A4 and functioning as the alto voice of the modern string ensemble, typically with a larger body and longer vibrating string length than a violin but also made in violin-sized or unconventional forms.
In scope
- Instrument identity and evidence that it is a viola
- Body dimensions, construction and acoustic or electric configuration
- Installed strings, tuning, bridge and other playing setup
- Structural condition, response and playability
- Fit to a player and constraints on handling, adjustment and repair
Out of scope
- Viola plants and other non-instrument meanings of the name
- Bows, cases and detachable accessories as independently managed objects
- The player's anatomy, technique and medical condition
- Musical works, notation and ensemble roles
- Ownership transactions, insurance contracts and market valuation
Why it exists Filled
Enable an AI agent to recognise a viola, assess its playing condition and suitability, and decide which uses, adjustments or specialist interventions are appropriate.
Distinguishing features Filled
- Compare documented instrument type, string configuration and intended register with violin and cello alternatives; appearance or tuning alone is insufficient.
- Record whether its intended playing position is at the shoulder or uses another support arrangement, distinguishing standard practice from adaptations.
- Measure body length, vibrating string length and body proportions; assess them together rather than assigning identity from a single size threshold.
- Inspect body, neck, frets and string arrangement when distinguishing a viola from a viol or viola da gamba.
- Check whether a violin-sized or unconventional body is explicitly constructed and set up as a viola rather than treating small size as disqualifying.
What robots and AI may and may not do Filled
Must not
- Attribute an instrument to a famous maker without expert evidence.
- Help trade instruments or bows with protected materials without required permits.
- Adjust, open or repair a valuable instrument without the owner's authority and a qualified luthier.
Only with a human decision
- Valuing an instrument for sale or insurance.
- Accepting an instrument with doubtful provenance.
May
- Describe the viola, its range, tuning and repertoire from reliable sources.
- Record the provenance, maker attribution and condition of instruments in a collection.
Moral aspects Filled
- Fine instruments carry great value and history; false attributions defraud buyers.
- Some bows and fittings use materials from endangered species.
Who is affected
- Players and owners
- Makers and luthiers
- Endangered species
Owners Filled
Steward
The person who owns it.
Links to other meta-models Filled
parent
- Q57050725 - registry parent class
What else AI and robots need to interact with it Filled
Identity and identifiers required Filled
- Vercy registry: vr.tr.viola
- Wikidata: Q80284 (https://www.wikidata.org/wiki/Q80284)
Direct properties required Filled
- Instrument-type evidence: documented viola; physically assessed viola; uncertain attribution
- Sound-generation configuration: acoustic; electric; electro-acoustic; unresolved
- Body length: mm, with measurement landmarks and method
- Vibrating string length: mm between the string's nut and bridge contact points
- Installed string configuration: string count, ordered pitches, string identifiers and intended tuning
- String action: mm by string at explicitly identified fingerboard locations
- Bridge posture and seating: documented alignment, foot contact, deformation and assessment confidence
- Structural integrity: observed cracks, open seams, deformation, movement and uninspected areas
- Playing response: tested response, buzzes, unevenness and problematic notes, with test conditions
- Player and support fit: identified player, chinrest or shoulder support, reach observations and trial outcome
Recognition required Filled
- A viola commonly has a violin-shaped body larger than a violin and is held under the chin, although violin-sized and unconventional forms also occur.
- Four strings with a lowest C string and music written mostly in alto clef.
Capabilities and actions required Filled
- Identify and document the viola while preserving uncertainty about its type or attribution.
- Assess suitability for a particular player's reach, support arrangement and musical requirements.
- Check tuning and select compatible replacement strings using the instrument's documented setup.
- Conduct a bounded playing trial and record response problems under known conditions.
- Identify conditions requiring a luthier or electric-instrument specialist before further adjustment.
- Plan handling, storage and maintenance around the instrument's construction and observed condition.
Hazards and failure modes required Filled
- Heat and humidity changes crack the wood and loosen joints.
- Prolonged playing can cause repetitive strain injuries.
Standards and interfaces required Filled
- Convention on International Trade in Endangered Species of Wild Fauna and Flora, which governs some woods and materials used in instruments and bows.
Context of use required Filled
- The viola provides the alto register in orchestras, string quartets and other chamber ensembles.
- It is also used as a solo instrument and in teaching, rehearsal and recording settings.
- Players normally support it between the shoulder and chin and sound its strings with a bow or by plucking.
Sources Filled
- Viola - Instrument identity, CGDA tuning, body-size practice, alto-clef use, and the usual confusions with violin, cello, viola da gamba, and viola d'amore.
- viola (Q80284) - Canonical Wikidata item for the musical instrument as distinct from the plant genus Viola and from guitar-family instruments called viola in Portuguese.
- Viola (The New Grove Dictionary of Music and Musicians / Grove Music Online) - Specialist history of the viola da braccio line, construction relative to the violin, and the lack of a single standardised body length.
- Systematik der Musikinstrumente: ein Versuch (Zeitschrift für Ethnologie, 1914) - Hornbostel-Sachs class 321.322 (necked box lute) with the bow suffix used for the violin family, including the viola.
Open questions
- Does vr.tr.viola explicitly denote the musical instrument, and does an existing world model already own this concept?
- Which historical, electric, extended-range or adapted viola forms must this registry entry include?
- Which authoritative measurement conventions and size terminology should be used across different viola designs?
- What construction-specific evidence should distinguish routine player maintenance from adjustments requiring a luthier?
- Which repeatable playing assessments and expert criteria can support readiness decisions without presenting tonal preference as an objective defect?
Machine files
Provenance
thing registry research (pass 2) · unreviewed
Built from: models/things/publications/thing-q80284/spec.json