It is directed by Anubhav Sinha stariing Shahrukh Khan , Kareena kapoor as in the song Chamak Chalo. Akon has sung the song Chamak Chalo which has already been leaked on the internet as per the rumors say. The music of Ra.One is not still released upto date but this song is smashing the streets.
The movie is written by David Benullo and Shahrukh Khan mainly.
You can download the song chamak chalo from the link below, copy paste it in your browser,