You're asking about two very different, iconic Indian hits, the viral 2011 song "Why This Kolaveri Di" from the film 3, composed by Anirudh Ravichander, and the famous "Koi Mil Gaya" song from the 1998 movie Kuch Kuch Hota Hai. The first song is a popular "soup song" sung by Dhanush, while the latter is a beloved romantic track featuring Shah Rukh Khan and Kajol.
Check out the recording session of the viral 'Kolaveri' song here: kolaveri mil Gaya ????????