Amitabh Bachchan may lend his voice as a narrator in the Ranbir Kapoor and Sai Pallavi starrer movie 'Ramayana'. "His voice adds gravitas that no one else can match...the makers are keen that the film opens with his voice...Having him open the film...will have strong impact," Mid-Day reported, quoting sources. The actor may lend his voice to the character Jatayu.