Twelve instruments, two ensembles, one disputed classification table
The music room of a secondary school holds twelve instruments: khol, dhol, bhortal, khutitaal, pepa, gogona, xutuli, dotara, harmonium, tabla, violin and bansuri. The teacher has three jobs: equip a Husori and Bihu ensemble for the Republic Day function; provide a minimal, stylistically defensible accompaniment for a Borgeet at the namghar; and submit a table classifying every instrument under the four traditional classes - tata, sushira, avanaddha and ghana - flagging any disputed case. Two draft tables already conflict: one puts the gogona under sushira because it is made of bamboo, another puts it under ghana; one puts the harmonium under tata because it has keys. The teacher also has to explain to a student why the dhol and the pepa, both loud and both 'Assamese', are not interchangeable between these two ensembles.
1. Resolve the two disputed classifications and state the principle that decides them.
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Classify by how the sound is produced, not by material or by appearance. The gogona is a bamboo jaw harp: the player flexes a cut tongue and the sound comes from a vibrating solid, not from an air column, so within the fourfold it belongs to ghana; in Hornbostel–Sachs it is a lamellophone, a subclass of idiophones. The 'bamboo, therefore sushira' argument confuses material with mechanism, since a bamboo flute is sushira because the air column sings, and the same bamboo in a gogona does not. The harmonium is driven by air from the bellows exciting free reeds; the keys are only the mechanism. It is sushira, a free-reed aerophone, and 'keys, therefore tata' confuses a keyboard with a string. The principle to write at the head of the table: identify the vibrating body, then name the class. For genuinely disputed cases, add a footnote giving the reason, because in this examination the reason earns more than the label.
2. Allocate instruments to the two ensembles, naming what you would exclude and why.
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For the Bihu and Husori ensemble: dhol for the pulse, bhortal or taal for the cycle, pepa for the horn motif, gogona for rhythmic jaw-harp patterns, xutuli for whistle accents, dotara or bansuri for a light melodic line. Exclude tabla, which brings a Hindustani stroke vocabulary with no role here; exclude the harmonium, which thickens and equal-tempers a sound world that does not need it; exclude the violin, whose bowed sustain competes with the voice in a small hall. For the Borgeet: khutitaal is essential because the cymbal marks the tala and the singers listen to it; khol may be added softly where the tradition uses it; a drone from a tanpura, or a harmonium used only for the drone, settles the pitch. Exclude dhol, pepa, gogona and xutuli, whose volume and stroke character belong to the outdoor, processional world and contradict a seated, slow, devotional delivery. The test is function, not nationality: an instrument can be Assamese and still be wrong for this item.
3. A student proposes replacing the pepa with the violin 'because the violin is in tune'. Give a reasoned verdict.
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The substitution looks reasonable only if the pepa's job were to play the tune accurately. It is not. The pepa is a horn whose function is signal and timbre: short, penetrating motifs that carry outdoors, with a tone nothing else in the ensemble produces. A violin can play the same pitches more accurately and will still fail, because it adds a sustained bowed line that competes with the singers, cannot carry outdoors without amplification, and imports a different idiom. Verdict: if no pepa player is available, cut the pepa line rather than replace it. If something must fill the gap, use a second gogona for pulse or a bansuri for a light melodic touch, and reassign the player. The examinable formulation: an instrument is defined by its function in the ensemble and the character of its sound, so pitch accuracy alone is never a criterion for substitution.