Findsounds: FindSounds.com is a free site where you can search the Web for sound effects.
Free Sounds: This site has a variety of free and copyright friendly sound effects you can use for educational projects.
Jamendo: Get songs from a variety of artists and genres to use for classroom projects.
Pandora Radio: Pandora Radio has free unlimited listening. Enter your favorite artist or song and search for positive results.
Sound Bible: This site has a lot of wonderful sounds you can use for projects.
Sound Snap: This site allows you to share and use free sound clips.
Youtube Audio Library: Browse and download free music for your project.