Listen to Radha Kathal Varadha online. Radha Kathal Varadha is a Tamil language song and is sung by M. S. Viswanathan and S.P. Balasubrahmanyam. Radha Kathal Varadha, from the album Kaadhal Ninaivugal Tamil Film Songs, was released in the year 2002. The duration of the song is 6:31. Download Tamil songs online from JioSaavn.