Listen to Kon Ba Desher Rajar Kumar online. Kon Ba Desher Rajar Kumar is a Bengali language song and is sung by Sachin Dev Burman, Robin Majumdar and Minati Banerjee. Kon Ba Desher Rajar Kumar, from the album Mor Prem Gaan, was released in the year 1941. The duration of the song is 3:09. Download Bengali songs online from JioSaavn.