that is a hard one to answer, I think some of the tracks from FF7 are just awesome, Diablo 2 as well had some awesome music, 2001 a Space Odyssey also had awesome music.
but I also love this track from Grim Dawn, http://www.grimdawn.com/media/Grim%20Da ... Lament.mp3
it has to be my favourite track of the game, and so nicely placed too, as when you return to the starting town, it plays,
but anyway, which is the most awesome? not really sure, some tracks will always stand out above others. so its a hard one to answer.