Earlier this year, Usher linked with Diplo to make "Climax," a pretty amazing heartbroken R&B track with masterful dance-music flourishes and an excellently subtle string arrangement from indie-classical wunderkind Nico Muhly. It's an early contender for single of the year and a fine reminder that, no matter what you may think of Usher and/or Diplo, they are both extremely good ...