Watch Agar Tum Saath Ho Song from the bollywood movie `Tamasha` Singer: Alka Yagnik, Arijit Singh Music: A.R. Rahman Lyrics: Irshad Kamil Cast: Ranbir Kapoor, Deepika Padukone, Javed Sheikh, Nikhil Bhagat, Faraaz Servaia, Punam Singh Director: Imtiaz Ali