Listen to Kadhala Kadhala Duet online. Kadhala Kadhala Duet is a Tamil language song and is sung by Hariharan and Sujatha. Kadhala Kadhala Duet, from the album Avvai Shanmugi, was released in the year 2017. The duration of the song is 5:45. Download Tamil songs online from JioSaavn.