Which tutorial is it and who teaches it? It sound a bit like Chris Schlegel's Guitar Fundamentals 2 course but he doesn't do any "Rock Fundamentals" tutorials that I know of. It's probably one of Anders' tutorials. Are you perhaps referring to a rock related tutorial in "Guitar Fundaments"? Or is it the "Advanced Rock" branch of the core curriculum?

I know it's confusing so just do this: Go to the lesson that you're referring to, copy the link address, then post that link here, either in plain text or imbed it using the "Insert/edit Link" button at the top of the editing window. That way people will be able to help you.

Nicolai