Listen to Oi Mahamanab Aase online. Oi Mahamanab Aase is a Bengali language song and is sung by Swagatalakshmi Dasgupta. Oi Mahamanab Aase, from the album Prayer Songs For Christmas - Bengali, was released in the year 2017. The duration of the song is 3:01. Download Bengali songs online from JioSaavn.