What is the reason for the success of 'why this kolaveri di' song? For the past few days, many of us might have heard the song, 'why this kolaveri di'. This song is from the film 3 where Dhanush and Shruti hasan play the lead role. The music director is Anirudh. Only one song was released from this film and that too became a massive hit. What do you think is the reason for the popularity of the song?