सा(षडज)

Indian music is based on the disciplined use of tones and rhythms. The group of seven vowels is called octave. The Indian music octave has seven tones-

Sa (Shadaj), Re (Rishabh), G (Gandhar), Ma (Medium), Pa (Pancham), Dha (Dhaivat), Ni (Nishad)

Of course

Sa, re, c, m, padh, ni