Paa's music has been out for a while. The title song rendered by AB is only next to Maa by shankar mahadevan, though in an entirely different genre. Beautiful lyrics by swanand kirkire. Illayraaja has been recycling tunes from his non-Hindi movies for sometime. Paa too is one of them - here is the original sung by Illayraaja himself from a recent Tamil movie. Illayaraja doesn't sound as cool as SDBurman tho :) The older version has multiple string instruments in the interlude, while the newer version relies on a more complicated percussion. But the real credit for this song goes to AB for his mindblowing rendition.
and it couldn't get more difficult to distinguish between real and contrived than this speech by Om Puri.