Listen to Incomplete (Originally Performed by Backstreet Boys) [Instrumental Version] online. Incomplete (Originally Performed by Backstreet Boys) [Instrumental Version] is an English language song and is sung by Karaoke Collective. Incomplete (Originally Performed by Backstreet Boys) [Instrumental Version], from the album A-Z of Karaoke - Songs That Start with "I" (Instrumental Version), was released in the year 2013. The duration of the song is 3:50. Download English songs online from JioSaavn.