Viriboni by Pachimiriyam Adiappa(guru of Shyama sastri) is an excellent piece.
I have MS and Chembai collections of it & both of them sing it wonderfully.
Where is this place called "Pachimiriyam"?

Also, Bhairavi and Mukhari sometimes seem very close.There was a discussion on this in Sangeetham.com BBoard.

Is Kalyani and Bindavana Saranga Raagam also very close to each other.I heard an amateur violinist playing "Vasudevayani" and thought it was similar to "Kalyiguga Varadhan" song.Since I'm a newbie with no formal training in music,i might be wrong