Listen to Aar Koto Kal Thakbore online. Aar Koto Kal Thakbore is a Bengali language song and is sung by Mahbuba Rahman. Aar Koto Kal Thakbore, from the album Kaljoye Gaan, was released in the year 2015. The duration of the song is 3:07. Download Bengali songs online from JioSaavn.