Spaceship Coupe, the sixth track on The 20/20 Experience, is a nice smooth ballad. Justin's vocals on this one are silky and the arrangement is relaxing, even though the interstellar theme is a bit off. There's even a little hint of funk in music track, which is a nice touch. Check out Spaceship Coupe.
Also check out my reviews of the first five cuts on The 20/20 Experience:
Pusher Love Girl
Suit & Tie
Don't Hold the Wall