"Challa", the first song from Shah Rukh Khan's much-awaited movie, "Jab Tak Hai Jaan", was released on Monday. Oscar-Award winner A.R Rahman composed the score for the film which is produced under the Yash Raj Films banner.
The lyrics of "Challa" is written by Gulzar and sung by Sufi singer Rabbi Shergill. The song is filmed in several crowded spots of London, with Khan seen playing the guitar and is a solo number on the hero. The two-minute song shows a glimpse of one of the heroines - Katrina Kaif - right at the end.