Balki's upcoming film, Chup, is set to mark the debut of legendary superstar Amitabh Bachchan as a music composer.

Chup was an idea that Balki had thought of right after Cheeni Kum, and talking about the film, he said, "Chup is special for more than one reason. For me, the biggest reason is it marks the official debut of Amitabh Bachchan as a music composer. Amitji saw Chup and played an instinctive original melody on his piano as he relived the film. It was his way of expressing his feelings for the film, paying a tribute. This composition, his gift to the film, will be the end title track of Chup. I don't think there can be an artist whose sensitivity can beat Bachchan's and Chup has his touch!"

Starring Sunny Deol, Dulquer Salmaan, Shreya Dhanwanthary and Pooja Bhatt, the film has screenplay and dialogues co-written by R Balki, critic-turned-writer Raja Sen, and Rishi Virmani.

Backed by the late stock investor Rakesh Jhunjhunwala, Anil Naidu, Dr. Jayantilal Gada (PEN Studios) and Gauri Shinde, Chup is set to be released on September 23.