The trailer for Imtiaz Ali’s new musical, Amar Singh Chamkila, was launched in Mumbai on Thursday. Set in Punjab in the turbulent 80s, the film stars Diljit Dosanjh as legendary folk singer Amar Singh Chamkila. Ali’s film charts the rise of Chamkila, regarded as the ‘Elvis Presley of Punjab’, as he navigates success and cynicism, idolatry and infamy. The life …