Listen to If I Didn't Know Better (In the Style of Luther Vandross) [Official Instrumental Backing Track] online. If I Didn't Know Better (In the Style of Luther Vandross) [Official Instrumental Backing Track] is an English language song and is sung by Original Backing Tracks. If I Didn't Know Better (In the Style of Luther Vandross) [Official Instrumental Backing Track], from the album Karaoke Hits: Soul Hits Vol. 2, was released in the year 2013. The duration of the song is 4:04. Download English songs online from JioSaavn.