I am always on a never-ending quest to find open access content for use in video projects. Thanks to a post I ...um....posted...on LM-NET, on another topic, someone sent me a link to Musopen.
This site hosts music from the likes of the US Marine Band and your local high school. Most of the selections are classical, all are downloadable and free. Performance quality varies (as you can imagine), but, hey. It's free!
I still like Freeplaymusic best (it organizes music by mood, for one thing!), but options are good!