Listen to Poo Ondru Valarthen online. Poo Ondru Valarthen is a Tamil language song and is sung by S.P. Balasubrahmanyam. Poo Ondru Valarthen, from the album En Thangai Kalyani, was released in the year 1987. The duration of the song is 3:34. Download Tamil songs online from JioSaavn.