I saw Oblivion last night and thought it was excellent. Equally excellent is the movie’s soundtrack, which was written and arranged by M83 and Joseph Trapanese. Trapanese also helped arrange the music to Tron: Legacy, which is why if you liked that soundtrack you’ll no doubt like Oblivion’s as well.
The soundtrack is also available on Rdio, which is where I’m listening to it as I type this very sentence.