I don't understand guitar hero.....
Why not just play a guitar? You can buy one for the same price.  
i play a guitar...i play rock band to...for entirely different reasons, and they are incomparable. ITS A GAME, its fairly mindless entertainment. and it can be pretty fun. 
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Theres a dork at the college and he carries around his little toy guitar controller around in a real guitar case. And then brags how good he can play his game.
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these kids are retarded though.