Listen to Thathi Chellum - Duet online. Thathi Chellum - Duet is a Tamil language song and is sung by Vani Jayaram and Saibaba. Thathi Chellum - Duet, from the album Thanga Pathakkam, was released in the year 1974. The duration of the song is 4:50. Download Tamil songs online from JioSaavn.