The song "What a Karuvaad" is from the movie Velaiyilla Pattathari, and it is sung by Dhanush and Anirudh Ravichander. The lyrics are penned by Dhanush. The song is composed by Anirudh Ravichander and features a lively and catchy tune. The lyrics express a mix of emotions and experiences, and the song has gained popularity for its energetic and engaging composition. The song has been well-received by the audience and has become a favorite among fans of Tamil music.