Thanks Usha Shankar...is it perhaps the same instrument that plays in the prelude of `kadalOran, kadalOram, alaigaL odi veLayAdum' from the film Anadha rAgam? ...You can hear a similar sound through out the song...even in interludes, just before KJY starts -`nelaththukku sondhakkAran pala pEru uNdu..'