Listen to Purpose (Originally Performed By Justin Bieber) [Piano Karaoke Version] online. Purpose (Originally Performed By Justin Bieber) [Piano Karaoke Version] is an English language song and is sung by Sing2Piano. Purpose (Originally Performed By Justin Bieber) [Piano Karaoke Version], from the album Purpose (Originally Performed By Justin Bieber) [Piano Karaoke Version], was released in the year 2015. The duration of the song is 2:54. Download English songs online from JioSaavn.