Things of the Fundamental Note

The fundamental note is the centre of every scale and everything starts here.
It is determined by each singer’s criteria and that sound becomes Sa.
The scale is Sa Re Ga Ma Pa Dha Ni ‘Sa.

The fundamental tone is played as a drone (basso continuo) and the melodies always sing scales centred on it
What is expressed is Raga.
Each scale of every raga is thought to be centred on Sa, the fundamental note.
In the performances that sometimes last for more than an hour, Sa sits in the centre of the scales as an immovable entity.