Four Vadyas, Ten Labels: Classifying a School Instrument Wall
A school is mounting a 'Families of Indian Instruments' listening station. Ten instruments must be grouped under the four vadyas of the Natyashastra: tata (string), avanaddha (membrane), sushira (wind), ghana (solid). The list: sitar, sarangi, rudra veena, santoor, shehnai, bansuri, ghatam, mridangam, jal tarang, kartal. A volunteer has drafted the wall: santoor under ghana 'because it is struck with mallets', jal tarang under sushira 'because it uses water and air', ghatam under avanaddha 'because it is a drum-like pot', rudra veena under tata. The music teacher also wants a short note on the Hornbostel–Sachs scheme for older students. Budget allows exactly ten printed labels, one per instrument, plus one small information panel; nothing can be reprinted after the weekend.
1. Correct the volunteer's draft. Justify each correction by naming what is vibrating.
Read the worked answer
Corrections:
- Santoor → tata, not ghana. The striker is not the sounding body. The santoor's sound comes from a hundred-odd stretched strings over a trapezoid box; the mallets merely excite them. A hammered string is still a string instrument. (Compare the piano, which no one files under idiophones.)
- Jal tarang → ghana, not sushira. What vibrates is the porcelain bowl - a solid body. The water's job is to change the bowl's effective mass and therefore its pitch; it is a tuning medium, not the vibrator. No air column is being split, which is what sushira requires (bansuri, shehnai).
- Ghatam → ghana, not avanaddha. Avanaddha requires a stretched membrane (mridangam, tabla, dhol, dholak). The ghatam has no skin; the pot itself is struck and the whole body resonates. It belongs with ghana, alongside kartal and jal tarang.
- Rudra veena → tata: correct, and worth saying why: a gourd-resonated stick zither with frets and struck-with-plectrum strings, still defined by vibrating strings.
- Straightforward placements: sitar, sarangi, rudra veena → tata; shehnai, bansuri → sushira; mridangam → avanaddha; ghatam, jal tarang, kartal → ghana.
Volunteer's underlying error: classifying by how the player acts (strike, blow, pour) rather than by what vibrates.
2. Explain the principle behind the fourfold scheme, and where it strains on this particular list.
Read the worked answer
Principle. The Natyashastra's four vadyas classify by the nature of the primary vibrator: a stretched string (tata), a stretched membrane (avanaddha), a column of air (sushira), and a resonant solid mass (ghana). It is a scheme of sounding bodies, not of playing technique, ensemble function or social use.
Where it strains here:
- Mode of excitation is culturally salient and the scheme is deaf to it. Santoor (struck strings), rudra veena (plucked with plectra on frets), sarangi (bowed) are all tata, yet they behave completely differently - a visitor cannot tell that from the label.
- Composite bodies. The jal tarang mixes solid vibration with a liquid tuning system; the scheme has no vocabulary for the water.
- The ghana bin is very wide. Kartal (small metal clappers), ghatam (a fired-clay pot) and jal tarang (a row of bowls) share a label while sharing almost nothing in technique, timbre or repertoire.
- No slot for electronic or newly invented instruments, which matters if the wall is ever extended.
Practical line for the teacher: the fourfold scheme is a good first sort because it is the tradition's own vocabulary and matches what students hear in textbooks; it is not a scientific taxonomy, and the information panel should say so in one sentence.
3. Advise on the Hornbostel–Sachs note: which labels would change, and is it worth the panel space?
Read the worked answer
What H–S would change:
| Instrument | Natyashastra | Hornbostel–Sachs |
|---|---|---|
| Sitar, sarangi, rudra veena | tata | chordophones |
| Santoor | tata | chordophone (struck box zither) |
| Shehnai, bansuri | sushira | aerophones |
| Mridangam | avanaddha | membranophone |
| Ghatam | ghana | idiophone (struck vessel) |
| Jal tarang | ghana | idiophone (struck vessel) |
| Kartal | ghana | idiophone |
On this particular list, only terminology changes, not membership: the four bins map almost one-to-one onto chordophone, aerophone, membranophone and idiophone. That is exactly the interesting point - the two systems agree here because both sort by the vibrating body. H–S earns its keep in the sub-categories (struck versus plucked versus bowed chordophones), which is where the Indian fourfold scheme goes quiet.
Advice on the budget. Ten labels plus one panel. Put the fourfold names on the labels - they are what the syllabus uses and what the students will be examined on. Put H–S on the single panel as a two-sentence 'elsewhere in the world, the same idea is called…' note, with the struck/plucked/bowed distinction as the one example. Do not attempt to relabel instruments bilingually with no reprint budget; a half-translated wall is worse than a well-explained one.