Listen to Oi Mahasindhur Opar Theke online. Oi Mahasindhur Opar Theke is a Bengali language song and is sung by Manna Dey. Oi Mahasindhur Opar Theke, from the album Unforgettable Manna Dey - Bengali Songs, was released in the year 2019. The duration of the song is 3:41. Download Bengali songs online from JioSaavn.