India, April 25 -- Filmmaker Imtiaz Ali and music maestro AR Rahman created magic with the Ranbir Kapoor-starrer Rockstar, delivering iconic tracks like Kun Faya Kun and Phir Se Ud Chala. In a recent interview with O2India, Imtiaz shared behind-the-scenes anecdotes from their collaboration - including the time Rahman "ghosted" him. He also recounted a surprising moment during the recording of a song when the chorus singers refused to believe they were actually working with AR Rahman himself. (Also Read: 'Nice to blame me for everything': AR Rahman reacts to Abhijeet Bhattacharya slamming him for overusing technology)

Imtiaz Ali had approached AR Rahman for Rockstar, but got busy making Jab We Met and Love Aaj Kal. When he later approache...