I love music when I'm playing and actively scoring a game, but I don't like either of these strategies. Some of my best game experiences have involved the kind of music I actively listened to at the time. In a Star Wars game, our seedy crew of a dilapidated starship flew through space and descended through the atmosphere to the sounds of Beck - funky, spacey, zany, with a drop of cowboy music. In a pulpy game built around kinetic action and fighting Nazis (of course), the drum and bass of the Propellerheads drove the action. If you like hip hop, I can attest that it fits in a huge range of scenes beyond the club.
The point is that many of my most fun game moments include the bobbing of the head. No matter how elegant the rules are or how robust the setting is, it's about being social with a bunch of friends imagining the same thing. Good music is one of the most underrated game aids in this respect.
And beer doesn't hurt either.