Classification of Instruments: Tata, Sushir, Avanaddha, Ghan
What the domain covers
The exam asks for the chaturvidha (fourfold) classification, examples of each class, and occasionally the reasoning behind a placement. Questions are often 'name the class of these four instruments'.
Core rules and concepts
The four classes come down from Bharata's Natyashastra and are still the standard in Hindustani music:
- Tata (stringed) - sound from stretched strings, plucked or bowed: veena, sitar, sarod, tanpura, sarangi, violin, santoor.
- Sushir (wind) - sound from vibrating air: bansuri, shehnai, nagaswaram, harmonium (bellows drive air past reeds), surpeti.
- Avanaddha (membrane) - a leather-covered resonator struck by hand or stick: tabla, pakhawaj, mridangam, dholak, damru, nagara.
- Ghan (solid/idiophone) - a solid body struck, with no string or membrane: jaltarang, manjira, kartal, ghatam, ghungroo, thali.
Modern organology maps these onto chordophone, aerophone, membranophone and idiophone, which is a useful cross-check in a one-mark question.
Worked example
Classify four instruments and justify each: sitar → tata, because a plucked string vibrates over the bridge; shehnai → sushir, because a reed sets an air column vibrating; tabla → avanaddha, because a leather membrane is struck; jaltarang → ghan, because porcelain bowls themselves sound. Note the harmonium: students mark it tata because it has a keyboard, but the sound source is an air-driven reed, so it is sushir.
Traps that cost marks
- Sarangi and violin are tata (bowed stringed), not sushir.
- Jaltarang, ghungroo and manjira are ghan, never avanaddha.
- Ghan does not mean 'only metal'; anything solid struck without a membrane qualifies.
- Write the Sanskrit names, not just English, when the question is in Hindi.