The soundtrack of Ra.One was composed by Vishal–Shekhar, with the lyrics being written by Atahar Panchi, Vishal Dadlani and Kumaar. A. R. Rahman provided the background score for a single sequence. Sinha announced that R&B singer Akon and the Prague Philharmonic Orchestra would be a part of the soundtrack; the former lent his vocals for "Chammak Challo" and "Criminal", while the latter performed in "Bhare Naina". The composers obtained the official license to use Ben E. King's "Stand By Me", on which they based the song "Dildaara". The soundtrack contains fifteen tracks, including seven original songs, four remixes, three instrumentals and an international version of "Chammak Challo". The music rights were bought by T-Series for . The Hindi version of the soundtrack was released on 21 September 2011; the Tamil version was released on 5 October 2011 and Telugu version was released on 9 October 2011 respectively, featuring six tracks each.
