Now that we all know that the very fresh pair of Alia Bhattand Ranveer Singh will helm ZoyaAkhtars next directorial venture GullyBoys it is time to know why this pair and none other was seem to be the perfect fit for this film. Apparently both Alia andRanveerwill be doing a lot of rapping and singing in GullyBoys.Says a source in the know, Alia andRanveerare both singers off screen. Ranveeris also a keen rapper. This film requires both of them to play street singers. There will be a lot of improvisational singing by both of them.