Ranbir is all set to rock the big screen with Sanjay Dutt biopic, 'Sanju'. The trailer of this film is already gaining appreciation from the industry biggies as well as the viewers. Makers shared the first song with audiences titled 'Badhiya'. The song has already reached the one million mark on YouTube and is being liked by the audiences. Now Rajkumar Hirani and Vidhu Vinod Chopra have some special plans for A R Rahman who will be adding his musical magic to few of its songs. According to sources Music maestro, A R Rahman who is one of the best music directors of the Indian entertainment industry will be composing few of the tracks in the movie 'Sanju'. Rajkumar Hirani has directed this film and it would be the first time when he will be collaborating with A R Rahman. Talking about this collaboration Hirani told to a leading daily that they were facing quite challenges while shooting one of the movie songs for 'Sanju' as they were already done with the visuals and wanted someone who can create a song by keeping these visuals in mind and then Vinod suggested that there is only one person who can sort this out, A R Rahman. "We called him up asking to make the changes and without wasting any time he agreed to help us on this project. I was touched by his humor, his cinematic understanding is brilliant as he can enhance your images with his music". Rohan and Vikram Montrose have composed the album for the movie 'Sanju' and A R Rahman has composed one of its songs on Raju's request. The film is produced by Vidhu Vinod Chopra.