Listen to Un Dayavaal Thaan online. Un Dayavaal Thaan is a Tamil language song and is sung by L.R. Eswari, K. Veeramani and K. Somu. Un Dayavaal Thaan, from the album Sakthi Varugiral, was released in the year 1986. The duration of the song is 5:04. Download Tamil songs online from JioSaavn.