Where can I get free music for windows video maker? Help?!?

I want to make a youtube video, like an amv for Beyblade or Pokemon and I can't get my itunes music on there and I've tried everything in the book from daniusoft music converters to other suggestions that didn't work out for me. I'm trying to avoid limewire because of viruses so if anyone knows something please help! Also, I was wondering if I could use the audio from amvs I downloaded from youtube without having to use the clips? Also, I'm very clueless because i'm kind of computer illiterate (only had a computer for like two months) so detailed instructions help too. Anything that helps is appreciated and thanks! So if you can answer any of these questions or problems I appreciate it, thanks again!