Agar Tum Saath Ho Lyrics from the upcoming film Tamasha starring Ranbir Kapoor & Deepika Padukone. This lovely song is sung by Arijit Singh and Alka Yagnik. Its music is composed by A.R. Rahman and lyrics are written by Irshad Kamil. http://ilyrics.co/arijit-singh/tamasha-agar-tum-saath-ho-lyrics/