The music of Karan Johar’s 2 States has been composed by Shankar, Ehsaan and Loy. The climax wedding song Hulla Re has been sung by the father-son duo of Shankar and Siddharth Mahadevan. Confirming to us, the director, Abhishek Varman, said, “Siddharth always wanted to sing in the film, but could not get the right song to sing till Hulla Re came along. We needed two different textured voices and the father and son’s voices suited that. While Shankar himself is a classically-trained singer, who can sing high notes, he felt that Siddharth was able to sing the high notes with even greater ease than he himself is able to, and was very excited to see his son sing along with him.” We are sure Shankar’s wife and Siddharth’s mother Sangeeta will make a lot of hulla when she hears this song.