All of the REAL HALO series (everything after ODST is dead to me) have fantastic soundtracks - ODST's is a particular favourite of mine.
Final Fantasy 8 ( [url=https://www.youtube.com/watch?v=4M0k2KUpIYg ]Black Mages cover of Premonition, which is one of my favourite tracks from the game[/url])
Metro 2033