Listen to It S A Hap Hap Happy Birthday online. It S A Hap Hap Happy Birthday is a Hindi language song and is sung by Bhushan Dua, Kavita Paudwal, Neha and Paro. It S A Hap Hap Happy Birthday, from the album Happy Birthday, was released in the year 1998. The duration of the song is 3:11. Download Hindi songs online from JioSaavn.