Ace music director AR Rahman has completed composing music for 4 songs of Rajinikanth's movie 'Rana'. This Oscar Award winner has been kept busy working on the music of 'Rana' movie and has now completed composing for 4 songs . AR Rahman is now waiting for Rajinikanth's approval so that he can proceed further. And Rajinikanth is expected to sit with AR Rahman in couple of weeks time and then finalize the tunes. The superstar on the other hand is taking rest in his new house and avoiding all appoitments.