Big B's voice for Tagore's songs

It is known news that legend Amitabh Bachchan is very fluent in Bengali. Now, it is heard that he has rendered his voice for a song written by the iconic Rabindranath Tagore. The number goes Ekla Cholo Re... and this is for the new movie Kahaani which is being directed by Sujoy Ghosh. Sources say that the leading lady of the film Vidya Balan is also gearing up for rendering her voice to the album of Tagore's songs. Get set for this one folks.