The thriller film 3 gained high anticipation due to the viral marketing of what song that was written and sung by Dhanush, and composed by Anirudh Ravichander?
3 (2012 Tamil film): 3 is a 2012 Indian Tamil romantic-psychological thriller film written and directed by Aishwarya R. Dhanush in her directorial debut. 3 (2012 Tamil film):  The film gained high anticipation due to the viral marketing of the song "Why This Kolaveri Di". Why This Kolaveri Di:  The song is written and sung by Dhanush, and composed by Anirudh Ravichander.
Why This Kolaveri Di