Why This Kolaveri Di (Tamil: வொய் திஸ் கொலவெறி டி; English: Why this murderous rage, girl?) is a song from the upcoming Tamil movie 3, due to be released in 2012, composed by Anirudh Ravichander. The song is penned and sung by popular Tamil movie star Dhanush.^[1] A promo of this song was released on YouTube on 16th November 2011, and it instantly became viral on social networking sites for its quirky "Tanglish" (Tamil–English) lyrics. Soon, the song became the most searched Youtube video in India

Music Video:
This song was initially leaked on the Internet, and the makers, having noticed its popularity, decided to go for an official release. The music video features the actor-playback singer Dhanush singing the song in AM Studios, and composer Anirudh at the piano, while Dhanush's wife Aishwarya Rajinikanth who is the director of this movie and co-star Shruti Haasan watch along and give suggestions.

Release:
Upon release, the hashtag #kolaveri topped the Indian trends in Twitter on the evening of 21 November 2011. Within 8 days of the video release, the song has more than 4.5 million views on YouTube. The video also saw a million shares on Facebook and trending continuously on Twitter. The song is also a hit among non-Tamilians as well due to the lyrics, which is partially Tamil and English.