The best way to learn music from your heroes

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I play guitar. And this has got to be the sweetest web app to learn how to play songs! You can slow down music; tabs are synced to YouTube vids. Check this out and don't tell me it's not cool -
Built by Adrian Holovaty, founder of EveryBlock (RIP) and creator of the Django web framework. Great talk of his from XOXO in Portland: