I am a big fan of instrumental soundtracks that I can listen to as background music while working. If you look at some of my favorites soundtracks (exceptional works like The Rock, Inception, or Gladiator) they are most likely composed by Hans Zimmer. Hans Zimmer is amazing, and one of the the most prolific composers in movie-making today. He is in his late 50s and already has 100+ titles to his credit (and shows no signs of slowing down). And not only is Zimmer producing a lot, most of them are of exceptional quality, either nominated for or winning many awards.