I don't care what you're doing, you need to stop, right now, and watch this video.
There's not much I can say about this. Superlatives are inadequate. Words simply cannot do justice to the sheer genius contained herein. Is it the coolest thing that's possibly ever happened to Guitar Hero? Is it crazy teenagers with way too much time on their hands? Is it possibly some form of viral marketing video? It is the most utterly awesome thing you're likely to see all day?
Yes. Now watch.
Update: Yeah, it's a viral, created for Activision by ad agency Droga5. But does it really matter? It's still awesome as hell.
Thanks to GameCyte for keepin' it real.