Taken from ‘The Karate Kid’ soundtrack and from Bieber’s remixes album, ‘Never Say Never’ is an inspirational tune about fighting through adversity. The 18-year-old gets to play the role of mentor to young Jaden Smith, who raps a guest verse. In the video, Smith and Bieber sing and dance in the studio while playing footage of Smith’s appearance in ‘The Karate Kid' flick.