Originally Posted by: alucard0941haha, actually NONE of them know music theory and went to universites.

Actually Steve Vai attended the Berklee College of Music,
Kirk Hammett took lessons from Joe Santriani and I would think he knows a thing or two about theory,
And Eddie van halen is classically trained pianist so I'm pretty sure he know a little theory.

And that is just off the top of my head