so, download the game's source files and take the music to use it in your own game? why would anyone do this? there are SO many music people out there that could create custom music for your game, probably for free!
I checked out the tracks. There are 2 cd quality tracks by Brian Langsbard which are real orchestral recordings. All other music and sfx is extremely low sample quality (11kHz) - not worth it to reuse.