khol
Enable an agent to recognise a khol drum, assess its playing condition, and select suitable handling, tuning and maintenance actions.
Bundle → Layer → Finding → Questions Filled
5 bundles · 9 layers · 13 findings · 21 questions
Identity and tradition Establish which instrument the khol name denotes and how regional naming affects recognition.
Structural identification
Connect the khol label to observable construction.
Double-headed body
A museum record classifies a khol as a double-headed, biconical membranophone; use this as identification evidence rather than a complete acceptance rule. [Metropolitan Museum of Art](https://www.metmuseum.org/art/collection/search/503302)
- Does the candidate have a single tapered resonating body with two markedly unequal playing heads? definition
- Which physical and documentary evidence distinguishes it from a mridangam, pakhawaj or dhol? boundary
Names and use context
Record attributed names and musical associations without making one use compulsory.
Documented context
The Met associates khol with eastern India, Bangladesh and Vaishnava kirtan accompaniment; individual attributions require their own evidence. [Metropolitan Museum of Art](https://www.metmuseum.org/art/collection/search/503302)
- Who identifies this instrument as khol, and what locality or playing tradition supports that name? provenance
- When a source calls it mridanga, what confirms that it refers to this registry kind? boundary
Shell and head assembly Describe the interacting parts that produce the khol's two playing surfaces.
Resonating shell
Record profile, dimensions and material independently of assumptions about traditional construction.
Material-sensitive recognition
Wood is documented in a museum khol, so shell material must be recorded rather than inferred from the instrument name. [Metropolitan Museum of Art](https://www.metmuseum.org/art/collection/search/503302)
- What evidence establishes the shell material beneath any paint or covering? provenance
- What are the shell length, maximum diameter and opening diameters in millimetres? measurement
Membranes and fastening
Describe each head and its connection to the tensioning system.
Head-specific construction
A practitioner guide describes skin heads, tuning paste and lacing, alongside synthetic-head variants with mechanical adjustment. Record the actual assembly. [Khol instructional guide](https://kksongs.org/khol/chapters/lesson01.html)
- What membrane, rim and loading-paste construction is present on each head? definition
- Which dimensions and fastening details must match before a replacement head can be fitted? action
Playing and tonal response Relate the unequal heads, player orientation and tuning arrangement to observable sound.
Head roles and support
Identify playing surfaces without confusing their names with fixed physical left and right.
Orientation-independent head roles
The instructional guide distinguishes the small treble head and larger bass head and discusses seated and standing setups. [Khol instructional guide](https://kksongs.org/khol/chapters/lesson01.html)
- Which head serves each tonal role, and what local names does the player use? definition
- Which orientation and support give the player access to both heads without unstable loading? action
Response and adjustment
Establish repeatable listening checks and construction-specific tuning decisions.
Repeatable tonal assessment
Record stroke location, damping, test conditions and intended musical use before judging pitch, sustain or unwanted noise.
- What response does each head produce under an identified open and damped stroke? measurement
- What target response and adjustment procedure does a qualified player or maker specify for this assembly? action
Condition and care Assess damage and select care actions for the particular shell and head materials.
Damage and playability
Locate defects before using sound tests or tension adjustments.
Component condition assessment
Inspect shell cracks, membrane tears, detached loading paste and compromised fastenings separately; record whether playing is appropriate.
- Where are cracks, tears, paste losses or fastening defects, and how extensive are they? measurement
- Which observed defects require stopping play or obtaining specialist assessment before tension changes? action
Environment and intervention
Connect transport, storage and repair choices to material sensitivity.
Material-specific care
The practitioner guide reports environmental sensitivity of skin heads and breakage vulnerability of clay bodies. Establish care requirements for the actual instrument. [Khol instructional guide](https://kksongs.org/khol/chapters/lesson01.html)
- What storage and transport requirements does the maker or conservator specify for this shell and these heads? action
- What repairs or replacements have changed the shell, membranes, paste or tensioning arrangement? provenance
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.
Check these first
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these check these first hold for the sense of khol this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these real-world use hold for the sense of khol this model covers, and on what evidence? provenance
Failure modes and hazards
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these failure modes and hazards hold for the sense of khol this model covers, and on what evidence? provenance
Regional variation
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these regional variation hold for the sense of khol this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of khol 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
What it is Filled
A khol is a double-headed hand drum of eastern South Asia, traditionally made with a hollow terracotta body and unequal-sized membrane heads, used especially to accompany devotional singing.
In scope
- Identification through shell profile, unequal heads and documented instrument naming
- Shell, membranes, tuning paste and head-tensioning construction
- Separate bass and treble responses under specified playing conditions
- Playing orientation, support and carrying arrangements
- Condition assessment, tuning suitability and repair requirements
Out of scope
- Kohl eye cosmetic and other similarly spelled substances
- Mridangam, pakhawaj, dhol and other neighbouring drum kinds
- Kirtan compositions, rhythmic systems and performance events
- Religious institutions, beliefs and ritual systems
- Individual instrument inventories and manufacturer product catalogues
Why it exists Filled
Enable an agent to recognise a khol drum, assess its playing condition, and select suitable handling, tuning and maintenance actions.
Distinguishing features Filled
- Check for two membranes closing opposite ends of one resonating shell; a pair of separate drums does not meet this structural test.
- Look for pronounced inequality between the small treble head and larger bass head, together with the characteristic tapered body.
- Combine physical inspection with maker, collection or practitioner identification; the name 'mridanga' alone is insufficient to resolve neighbouring drum kinds.
- Do not make clay construction mandatory: a museum-catalogued khol has a wooden body. [Metropolitan Museum of Art](https://www.metmuseum.org/art/collection/search/503302)
- Check that sound is generated through played membranes; a sample library or electronic imitation belongs to a neighbouring model.
What robots and AI may and may not do Filled
Must not
- Mock or misrepresent the devotional singing it accompanies.
- Present a fibreglass or modern drum as a traditional clay one.
- Help trade instruments with skins from protected species in breach of the law.
Only with a human decision
- Using it in a religious setting or ceremony on a community's behalf.
May
- Describe the khol, its construction and its role in devotional music from reputable sources.
- Help a user learn, maintain or record it.
Moral aspects Filled
- It is tied to devotional practice; respect for worship matters.
- Skin heads raise animal welfare and legal questions.
Who is affected
- Devotional communities
- Players
- Buyers
Owners Filled
Steward
The person who owns and plays it.
Links to other meta-models Filled
parent
- Q55723287 - registry parent class
What else AI and robots need to interact with it Filled
Identity and identifiers required Filled
- Vercy registry: vr.tr.khol
- Wikidata: Q1436500 (https://www.wikidata.org/wiki/Q1436500)
Direct properties required Filled
- Identification basis: Link to maker statement, collection record or practitioner assessment
- Shell material: Terracotta; wood; composite; metal; other documented material; unknown
- Shell geometry: Length and maximum body diameter in mm; profile description
- Head diameters: Small and large playing-surface diameters in mm, with measurement convention
- Membrane and loading construction: Per head: membrane material, layering and tuning-paste presence; unknown where unverified
- Tensioning arrangement: Lacing; mechanical adjusters; other documented arrangement; unknown
- Head response: Per specified stroke: dominant frequency in Hz where identifiable and decay time in s
- Playing condition: Untested; playable; restricted use; repair required; conservation only
- Playing support: Lap; cushion; carrying strap; other documented support
- Use-tradition attribution: Named tradition or community with supporting evidence
Recognition required Filled
- A long barrel-shaped drum with a small head at one end and a larger head at the other.
- Terracotta body laced with leather straps, played horizontally with both hands.
Capabilities and actions required Filled
- Identify a candidate khol and record unresolved naming or construction evidence.
- Compare head dimensions and fastening arrangements before selecting replacement components.
- Document bass and treble responses using repeatable, condition-appropriate strokes.
- Select a supported playing orientation with access to both heads.
- Determine whether tuning, specialist repair or suspension of playing is appropriate.
- Prepare packing and storage requirements from the instrument's actual materials and condition.
Hazards and failure modes required Filled
- The clay body breaks easily if dropped.
Standards and interfaces not applicable Not applicable
Not applicable
No specific universal standard, law or official classification is applicable to the khol solely as this traditional drum type.
Context of use required Filled
- The khol accompanies devotional singing and ensemble music, especially in eastern South Asian traditions.
- Players strike its unequal heads with their hands to produce contrasting tones and rhythmic patterns.
Sources Filled
- Wikidata item Q1436500: khol - identity and sense of the item
- Wikipedia: Khol - general description of the item
Open questions
- Does the registry's original source identifier confirm that khol denotes the musical instrument?
- Which regional khol forms belong within this entry, and where do local uses of mridanga designate a neighbouring instrument?
- What evidence supports inclusion of composite and metal variants without creating unsupported registry subdivisions?
- Which head dimensions, tonal targets and tuning procedures are documented for particular construction traditions?
- What maker or conservation guidance establishes suitable environmental limits, repair materials and intervention thresholds?
Machine files
Provenance
thing registry research (pass 2) · unreviewed
Built from: models/things/publications/thing-q1436500/spec.json