Amitabh Bachchan is not new to singing. Experimenting with the art, the versatile actor has lent his voice to a rap number. With the recent trend set by Ranveer Singh in ‘Gully Boy’, Bachchan will also rap for the song ‘Aukaat’ for his upcoming release ‘Badla’. With Big B’s signature and heavy baritone, this number will be used as a promotional song for the movie. ‘Badla’ is a murder-mystery thriller, which will see the reunion of ‘Pink’ co-stars Amitabh Bachchan and Taapsee Pannu. Produced by Shah Rukh Khan, the film is directed by Sujoy Ghosh and will hit the screens next week.