Listen to Kathal Unthan Perai online. Kathal Unthan Perai is a Tamil language song and is sung by S.P. Balasubrahmanyam and Sujatha Mohan. Kathal Unthan Perai, from the album 90s Romantics Songs, was released in the year 2019. The duration of the song is 4:39. Download Tamil songs online from JioSaavn.