Listen to O Duniyar Mazdoor Bhai shob online. O Duniyar Mazdoor Bhai shob is a Bengali language song and is sung by Somobeto. O Duniyar Mazdoor Bhai shob, from the album Uttaran, Vol. 03, was released in the year 2020. The duration of the song is 3:06. Download Bengali songs online from JioSaavn.