This is reappropriated straight from the brilliance over at Vimeo. I've cut an copied the text and attributed the link to the page where you can also find some valuable info in the comments:
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Here are a couple places that you may want to check out that have royalty-free music that you can use:ccmixter.org/ - ccMixter is a community music site featuring remixes licensed under Creative Commons where you can listen to, sample, mash-up, or interact with music in whatever way you want.freesound.org