But on many occasions, when a filmmaker tells him the film's story, he knows in his heart, that he should not take up the film.
"When I am doing a song," he says, "the director has to live with the song and when I am doing a film's background music, I have to watch the film and have to live with the film all my life."
That is why he rejects many films, he adds.
Working for the third time with Gowariker reinforced Rahman's admiration for the filmmaker.
"Very few people recognise the kind of warmth in music, the pulse, the soul of the music," Rahman says. "He is one of them. Mani Ratnam and Subhash Ghai also are like him. Ashutosh has the talent for spotting fine music. There are so many ideas that he has to consider while working on a film. But to pick the right things and give them to the people, to present them in a very dignified way, is very important to him.
"There is no use in us in composing beautiful stuff and then getting it thrown away, without any respect to the music," Rahman continues. "It is very important for a director to sit and like something, and challenge the composer from time to time. Ashutosh does it."
Also read: A R Rahman, on rediff.com