Write out the notes of a raga and you have its scale, but you do not yet have the raga. A raga is defined as much by how its notes behave as by which notes it uses: which notes are stressed, how each is approached, and the phrases they habitually form.
Same notes, different music
Bhupali and Deshkar, two Hindustani ragas, use exactly the same five notes: Sa, Re, Ga, Pa and Dha. Trained listeners still tell them apart. A 2023 study by Achintya Prahlad measured the difference. Bhupali leans on Ga and settles in the lower half of the octave. Deshkar favors Dha, touches Re only lightly and gravitates toward the upper Sa. Mohanam, a Carnatic raga, uses the same five notes and is closest to Bhupali, yet it has a character of its own.
A note is a movement
In Carnatic music especially, a note is rarely a fixed point. A 2012 study of Carnatic music, presented at a workshop of the CompMusic research project, notes that only the tonic and the fifth stay relatively steady. The other swaras are commonly inflected by gamaka, the movement around and between pitches.
The study’s clearest example involves Sankarabharanam and Kalyani, two ragas that share the phrase Sa Ri Ga Ri. In Sankarabharanam the Ga is held still. In Kalyani it moves. On paper the two phrases are identical. In performance they are not, and experienced listeners often recognize a raga from one such phrase.
Listening for it
You do not need to know a raga’s name to hear how it behaves. Ask three questions:
- Where does the music come to rest?
- Does it lean low, or reach upward?
- Is a note held plainly, or approached with a sway or a slide?
For how raga works across the two classical traditions, see Carnatic and Hindustani: Two Distinct Listening Traditions. For more ways into melody and rhythm, see Start Listening.
Image: A Lady Playing the Tanpura, Kishangarh, Rajasthan, ca. 1735. The Metropolitan Museum of Art, 1996.100.1. Public domain.
