A reason I always played the Starfox Assault demo at stores.
The music of the first levels. I'm always the type for great battle music in the background.
Who can forget Star Wars X-Wing Series games? Some Tie Fighter Music:
Admiral Thrawn's Theme,
Inro theme of Tie Fighter, and
Victory for the Empire (best played in a loop),
Tech room, and
In-Battle (apparently this version of the track has alot of Imperials coming in, and a few Rebel reinforcements and some shit being blown apart. Hear it enough, or play the game, and you can imagine the battle that went on here just by themes alone, This apparently was a 5-minute long mission with a short victory trip back to your Star Destroyer while the victory theme plays.). Ahh, nostalgia. I list Tie Fighter since it had a more unique soundtrack compared to X-Wing and
X-Wing Alliance. Personally, I prefer the
DOS versions over CD-Rom versions.
The first in the X-Wing series I actually played 'til completion. The Imperial side actually rocked; having Thrawn leading your team to victory was also pretty badass. But the music was a surefire motivator.
Dune II, you know it to be true.
Building up,
Battle Music,
Spice Trip,
Epic War,
Marching Towards the End,
Dark Technology.
EDIT:
Okay, I guess Star Wars was a pretty obvious one I pointed out, but still, Tie Fighter did have a more unique soundtrack nonetheless.
EDIT EDIT:
And just because I linked to a part of it, I might as well link to the rest of it because it's too damn cool.
Death Star Tunnel Run. Oh the memories... The nightmares. So many attempts... Q_Q, but the victory was so worth the effort. All this flown with a joystick and keyboard, not a gamepad.
EDIT EDIT EDIT:
Just remembered another game with surprisingly good music.
Battle Clash and Metal Combat for the SNES. They so need to make a Wii remake or sequel of this game. It's been begging for one.