Listen to Poo Ondru Valarthen online. Poo Ondru Valarthen is a Tamil language song and is sung by T. Rajendra and S.P. Balasubrahmanyam. Poo Ondru Valarthen, from the album Oru Thayin Sabatham, was released in the year 1994. The duration of the song is 3:36. Download Tamil songs online from JioSaavn.