Frank Kogan

Not sure what you mean by "exclude," actually. Was Xhuxk excluding from Stairway to Hell the idea that some people would consider a lot of the music covered in the book not to be metal?

The "Marxist" position you describe is pathologically extreme, and seems more like an article of faith than an idea that one can actually put to use. I mean, you could say that all social conflict is due to the activity of elementary physical particles (if you happen to believe that everything is due to the action of elementary particles) but there's nothing you can do with that idea. In any event, I don't see how a Marxist (or anyone else) could argue that Bloods vs. Crips is an expression of conflict between economic classes. But he could say that the battle of Bloods Vs. Crips occurs in a society in which there's a lot of economic class conflict, and that this overall societal class conflict influences and maybe even helps to shape Blood Vs. Crips. (But then he'd have to say what the influence is.)