Double Oscar-winning composer A.R. Rahman may perform live at the audio launch of his upcoming Tamil film “Mersal” here on August 20, a source in the know has said. “It’s going to be a grand audio launch and Rahman sir may perform. He is yet to give his final nod but the makers are hopeful that he will accept the invitation and at least perform briefly,” the source, from the film’s unit, told IANS. Directed by Atlee and starring Vijay in the lead, “Mersal” marks their second time collaboration after last year’s blockbuster “Theri”. Vijay plays a triple role in the film, which is bankrolled by Sri Thenandal Studios. The three roles feature him as a panchayat head, a doctor and a magician. The film also stars Nithya Menen, SJ Suryah, Kajal Aggarwal and Samantha Ruth Prabhu. “Mersal”, which will have simultaneous dubbed Telugu release, is set to hit the screens this Diwali.