Listen to Aar Koto Kal online. Aar Koto Kal is a Bengali language song and is sung by Susmita Mukherjee and Krishnaprasad Bera. Aar Koto Kal, from the album Shyam O Shyamar Gaan, was released in the year 2016. The duration of the song is 6:26. Download Bengali songs online from JioSaavn.