If you are a fan of A Charlie Brown Christmas then you will love this page which allows you to pull down the music clips from the Television Special. Among my favorites is "Linus and Lucy" which I believe is played in quite a few Peanuts television specials.
Most of the Charlie Brown music was created by the late genius, Vince Guaraldi.
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Speaking of Peanuts, you might want to check out the Schulz Museum page here. That's another place on my list of places to see before I die.