Re: Legality of adding music?

Copyright law is vague, and I'm not highly educated in the field, but
here's the law:

http://www.freespeeches.net/fairuse.html

So, say your movie pertained to the instruction of how to play that
particular song, or an educational analysis of it, you would have a,
in my opinion, sound legal backing for that use.

Also, if you are "critizing" or "critical" of the piece of music, that
would be fine as well. If you are explicitly or implicitly comparing
that piece of music with other pieces of music, that might fly as well.

Simply adding a copyrighted piece of music that goes well with your
video, however, is typically a violation of U.S. Copyright law. If
you really want to use it, contact the artist save the e-mail that
says you can use it if they let you.