There are many sites that offer royalty free music to use for projects and presentations. Most often, the recordings are not free, however, there are some that allow free downloads. If you search, you may find some independent artists who allow use of their music for free if you give credit in the presentation. You may also check at the Music Library for
Public Domain and Royalty Free Music
A clearinghouse of information about and links to public domain and royalty-free music. They have gathered a large group of web resources to access and purchase royalty free music.
Artist Server
This is a social music site. It provides a filter to allow you to select music that is avialable for attribution or share alike or in the public domain.
Free Sound
Free Sounds provides sound clips all with a Creative Commons licesnse allowing for reuse.
Incomptech Royalty Free Music
Incompetch provides music with attribution required.
Jamendo Pro/Track
"Royalty free music for your video, audio and interactive projects"
Musopen
Musopen is a non-profit organization that provides free music resources.
Opsound
Opsound provides free music donated by artist using a Creative Commons Licesnse.
