Thank you Chandran Sir for the notes. Please clarify one doubt, If the song key note is D then A# would be komal Dha (D1 shudha dhaivatam). In Dwijavanti there is no sudha dhaivatham but komal Ni(Kaisiki Nishadam). Also D# would be shudha Rishabham (where asDwijavanti has both sadharan Gandharam and Antara Gandharam).So for the above notation isn't the tonic key of the song C? Kindly help to understand.