Ranbir Kapoor, Imtiaz Ali promote 'Rockstar'

Mumbai, September 12 (ANI): Bollywood actor Ranbir Kapoor and film director Imtiaz Ali promoted their upcoming film 'Rockstar' in Mumbai on Sunday. Kapoor, who plays the lead role, described the film as a musical journey and a love story of a local Delhi boy who transforms into a famous rockstar.The director of the film, Imtiaz Ali, informed that the music of the film, will be launched on September 20.