It is the best of all soundtracks I have ever heard. I believe it was by R D Burman. I am not sure.
Lets be clear about music.
Till now, no one even comes close to him in indian music world. But in my listening experience of all their music, IR has never plagarized or let them influence into his own composing styles. In my opinion, this is a chance for IR to focus on a real classic soundtrack instead of giving songs. Kamal should note this suggestion, somehow. If you have Kamal' website, I will present my suggestion.