Royalty Free Music

Below you will find links that take you directly to sites with music you might be able to use in your video.  A couple of links will take you to sites set up by others for the same purpose.  Be sure to read the right-to-use information for each site.  Some sites require different things in order for you to use their music.
A great site for creative commons free royalty free music with direct links to MP3 files that are original songs. You have my permission to use them for personal or commercial use with two options: Free with link or credit: Link to the site and or credit to "Free Royalty Free Music by". You can also use a photobanner or this sounder.mp3 for broadcast.

A great site where people can find fantastic, liberally licensed music. Be sure to click on the Creative Commons icons to find out the permissions to using the music.

Freeplay Music
This is a great site with lots of music and they make it very easy to search for the right sound. Be sure to check the licensing agreement. You cannot use this music in anything being used outside the classroom.

A community of free, legal and unlimited music published under Creative Commons licenses. Be sure to check each of the songs for individual licenses.
Not only do they have a number of great tracks available for free (with attribution), but you can also purchase 
the complete rights to tracks for only $0.99.  According to the site owners, every purchase comes with a license agreement to your name.

All the music on the site is licensed under the terms of a Creative Commons Attribution License 3.0. Click here for the overview and here for the full terms (or click "the Legal Code (the full license)" link at the foot of the overview page).