High Quality Content by WIKIPEDIA articles! Chammak Challo is a song composed by music director duo Vishal-Shekhar as a part of the soundtrack for the 2011 Bollywood film Ra.One. The song`s male vocals were provided by international pop star Akon, while the female vocals were provided by Hamsika Iyer. Chammak Challo is also noted for being the first musical collaboration of Akon with Indian artists. There are four other versions of the song in the album, including a remix by Abhijit Vaghani, another remix by DJ Khushi and an international version sung solely by Akon with no female vocals. The song, along with the rest of the soundtrack, was officially released on September 12, 2011. However, the song faced controversy when the rough version was leaked on the Internet on May 31, 2011.