http://ilyrics.co/arijit-singh/tamasha-agar-tum-saath-ho-lyrics/ Agar Tum Saath Ho is a melodious duet song sung by Alka Yagnik & Arijit Singh. This song is composed by AR Rahman with lyrics penned down by Irshad Kamil featuring Deepika Padukone & Ranbir Kapoor.