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Try www.weddingwire.com/weddingsongs they have a great selection for the entire wedding.
I found Amazon.com to be useful. I'd like to walk down to Pachelbel's Canon, but couldn't find a version I liked. i searched tons of wedding cds on Amazon and still had trouble. Finally, I just did a search for Pachelbel's Canon and the website brought up tons of versions and I found one that way. And you can purchase the MP3s for only $0.99 rather than buying a whole cd for one or two songs. :-)