Command and Conquer: Red Alert 3
I've always been a Command and Conquer fan and the soundtrack when the game was released was a big part of it. The theme of the music pulled me in and hyped me up to take command and annihilate my enemies. The reason I specified Red Alert 3 is that it remade much of the older music and remastered them to sound much nicer (modern technology and all that). In the same way Eye of the Tiger motivates you to exercise or warm-up before sports, Red Alert prepared you play a wargame and kick ass doing so.