Mumbai, Jan 8 (ANI): Bollywood actors, Priyanka Chopra, Ranveer Singh and Arjun Kapoor, recently launched music of their upcoming movie, 'Gunday' in entertainment capital, Mumbai. The story is based on lives of two small time thieves who later get involved in the coal mafia. Director of the film, Ali Abbas Zafar, who was also present at the music launch, said that the film is set in 1970's where Singh and Kapoor play gangsters.