Mumbai:Music composer-singer A.R. Rahman, who has composed the music for Ashutosh Gowariker's film "Mohenjo Daro", sang a melodious song "Tu Hai" from its soundtrack at a promotional event for the film. The romantic number has been composed by music maestro and sung by him and Sanah Moidutty. Director Gowariker introduced the entire cast and crew to the media before Rahman's performance. Starring Hrithik Roshan, debutant Pooja Hegde and veteran actor Kabir Bedi, the movie is an epic adventure-romance, set in the ancient city of Mohenjo-daro, now in Pakistan's Sindh province in the era of the Indus Valley civilisation that dates back to 2600 BC. Debutante Pooja, a former beauty pageant contestant, has worked in the Telugu films "Oka Laila Kosam" and "Mukunda". The movie marks Gowariker's second collaboration with Hrithik after 2008 film "Jodhaa Akbar". "Mohenjo Daro" is all set to hit the screens on August 12.