Suddenly remembered this song in the morning. Its been stuck in my head since.
An absolutely beautiful composition by Illaiyaraja, great lyrcis by Valee and sung by the evergreen SPB, from the movie Ilamai Oonjal Aadukirathu. A great movie too, starring Kamal Haasan and Rajni. Definitely among their best performances. The last scene as Rajni drives off in his car is very poignant.