Here's the site I promised you guys!
If you are creating a Windows Movie Maker movie, or any other type of video, and you need backround music, here is a great place to get it. This site offers an ability to search by feeling (aggressive/driving, rockin'/happy, etc.), by style (grunge rock, hard rock, jazz, etc.) by instruments, by tempo (slow, med., fast, fast, etc.) and so on. You can download all of the files as .mp3's and you don't even have to register!!