Brutal Legend Soundtrack Question

[Golgatha]

Just wondering if the list of 107 metal songs is playable from within the game interface, if it's used as background music, or if just small snippets are used within the game. Thanks in advance for any info.

 

[Golgatha]

No one?

 

[Beev]

The songs play while you're in your car driving around the world. If you're on foot you don't hear anything.