Listen to Grahan Koo Ba Na Koro online. Grahan Koo Ba Na Koro is a Bengali language song and is sung by Uttam Dewan and Arif Dewan. Grahan Koo Ba Na Koro, from the album Behesti Saugat, was released in the year 2004. The duration of the song is 7:20. Download Bengali songs online from JioSaavn.