Imtiaz Ali`s `Rockstar` revolves around Janardhan Jakhar, played by Ranbir Kapoor, a young man from Delhi who dreams of becoming a rockstar like his idol, Jim Morrison

Filmmaker Imtiaz Ali explains why an Indian girl didn’t make it to become his lead in `Rockstar` opposite Ranbir Kapoor and what made him choose Nargis Fakhri, an American instead