0a.1 Sruti, the drone, and finding your own sa

Written from the tradition, August 2026. Nothing here is reproduced from any book; where teachers differ, the lesson says so instead of choosing quietly.

What this is and why it exists

Carnatic music has no fixed pitch. There is no note that is always sa. You choose your sa, and everything else is measured against it.

The drone holds that choice steady. It sounds your sa and your pa under everything you sing. Without it you drift, and you do not hear yourself drifting.

Getting this right in the first week saves months. A sa set too high tires your voice. A sa set too low takes the top notes off every exercise you will learn.

The vocabulary

Sruti — the pitch you have chosen for sa. It is yours, and it stays the same from one sitting to the next.
Sa — the first swara, and the note everything else is measured from. Its full name is shadja.
Pa — the fifth swara, panchama. It agrees with sa more completely than any other note does.
Adhara shadja — the sa your own voice sits around.
Drone — the continuous sound of sa and pa under the music.
Sruti box — a small electronic instrument that makes that drone. A phone app does the same job.
Tanpura — the four-stringed instrument that traditionally makes it.

The mental model

Think of the drone as a floor. Every note you sing sits at some height above it. The floor never moves.

Take the floor away and each note becomes a guess about the last one. A small error at the start grows into a large one by the end of the line. With the drone there, you hear the error at once.

That is why the drone goes on before you sing and stays on until you stop. It is not accompaniment. It is what makes the words "in tune" mean anything.

Your sa is a decision about your voice. It is not a decision about the music. Two singers in one room can be in different srutis and both be right. What is wrong is a sa that changes between Monday and Tuesday. Then nothing you practised on Monday is still true.

The work

Start the drone. A sruti box, a phone app or a tanpura all work.
Set it near the middle of your speaking voice.
Sing sa on top of it. Hold it for one comfortable breath.
Listen for a wavering between your note and the drone.
Move your note slightly until the wavering stops. That is sa.
Sing the sa one octave above, then the sa one octave below.
If the upper one hurts, lower the drone one step and begin again.
When both ends are comfortable, write the pitch down.
Use the same pitch tomorrow.

What you should now be able to explain or do

Set a drone and hold a steady sa against it. Say why you chose that pitch and not another. Explain what sruti means to somebody who has never heard the word. Say what goes wrong when a beginner practises with no drone.

Check yourself

Why is there no fixed pitch for sa?

Sa is chosen for the voice or the instrument in front of you. Everything else is measured from it, so the pitch itself carries no meaning. Two singers in different srutis are both right.

How do you know when your sa is exactly on the drone?

The wavering between your note and the drone disappears. That wavering is the only reliable target a beginner has.

Your sa feels bright for ten minutes and then your throat tires. What is the likely cause?

The sa is too high for you today. Lower it, and keep the lower one for a while.

Why write the pitch down?

So every sitting starts in the same place. A sa that moves makes each exercise feel new, and nothing accumulates.

Go deeper

Back to Sruti, the drone, and finding your own sa: work through the checklist