Nathan Ketsdever dropped a comment in the Tips for YouTube and Viral Video with lots of examples from e-politics. (see his live blogging of last night's YouTube debates). He made a good point about adding music. He mentioned using Creative Commons licensed music.
This made me think of some recommendations for music that Ivan Boothe mentioned recently (can't remember exactly which nonprofit tech list serv)
Here are some resources I've found for music.
Some of those are public domain, some are free, some are CC. Depending on the CC license, you should be able to use them without too much trouble. Generally CC licenses allow for use as long as it's noncommercial, you credit the source, and the license on the thing you are making with the music is also CC.
Our promo video, for instance, uses CC music: Any work produced by the federal government is also by definition in the public domain (with the exception of classified works, of course), although there are a few things in which they were contracted out that may not be covered. But that's not usually a good resource for music anyway.
Also, check out the podsafe music sites on Steve Garfield's Learn about Videoblogging.
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