I thought I'd take my BFF's
thread one step further, since I enjoyed it so much.
I'll start with a classic from one of my favorite games:
Super Castlevania IV.
This game had a soundtrack that was amazing and very diverse. It totally set the mood for fighting strange looking monsters and kicking some vampire ass!
note: the actual song isn't 15 minutes long, this just loops for 15 min.
After about 2 minutes, you get the idea...