Listen to Oi Hangso Mithun Aaj online. Oi Hangso Mithun Aaj is a Bengali language song and is sung by Amal Mukherjee. Oi Hangso Mithun Aaj, from the album Amal Mukherjee, was released in the year 1991. The duration of the song is 3:22. Download Bengali songs online from JioSaavn.