Play a shruti box or keyboard note. Keep hitting notes until you find the one that feels like the "home" note of the song. That’s Sa .
Example – "Vaseegara" (Minnale) :
sa ri ga ma pa da ni sa' (scale ascending) sa ni da pa ma ga ri sa (descending) Used by instrumentalists (violin, keyboard, guitar). Shows pitch on 5 lines + rhythm. c. Keyboard/Piano Notes (Letter Notes) Simplest for beginners: music notes for tamil songs
Thenmerku paruva kaatru