And I gotta add this song from Halo Reach is absolutely beautiful. It plays during *HUGE SPOILER* the ending when Noble Six fights to his death hopelessly outnumbered by hundreds of Covenant after single handedly saving Master Chief and pretty much the world by delivering Cortana. *END SPOILER.
Its just so sad and emotional. Halo truly is the King of FPS and the music is a huge part of that. The song is only 4 minutes long, do yourself a favor and listen.