This is apparently a stunt pulled by a bank. A little girl puts a coin in a musicians hat, then magical things start to happen. It's pretty cool.

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I'm not much on classic music, but this is really cool how it builds and builds. It's kind of an orchestra/flash mob and it's really neat.  I also like how the initial guy looks like Uncle Festers skinnier-better dressed brother. Yeah, he rocks it, but in a creepy mad scientist kind of way.  Here you go: