Listen to Bondhu Koto Kothin Tor Ontor online. Bondhu Koto Kothin Tor Ontor is a Bengali language song and is sung by Siraj Uddin. Bondhu Koto Kothin Tor Ontor, from the album Nidarun valobasha, was released in the year 2005. The duration of the song is 8:52. Download Bengali songs online from JioSaavn.