Class Soundtrack?

I just finished listening to 1up.com's Retronauts most recent podcast on video game soundtracks. It's also an interesting (if somewhat geeky) podcast about older games. The history of video game music they discussed brought back a flood of memories and emotions attached to the game's soundtracks. Just like movie soundtrack, (well done) game soundtracks can carry a lot of feelings and even motivation for the listener.

Does anyone out there use music in there instruction? I've been in conference presentations where people have talked about playing music as the class is entering in order to help set the mood. But what about setting a soundtrack or even a few music clips into a powerpoint, lecture, or workshop for dramatic effect?

I haven't tried it, but now I want to. Even a little music to draw attention to certain key points could be useful in grabbing some attention from the class. What do you think?