The core of it is the metal history, which then dovetails into metal philosophy, and then lists the top echelon of metal releases by year.
I agree with all but one word: "dovetails". Metal and metal subculture is a social phenomenon. What you call 'metal philosophy' IS the climax of this book, and it's the only thing that disconnects it from pop culture / teenage rebellion and connects it to the wider world of art, literature and philosophy. Metalheads aren't always sure what they're trying to say, but they've intuitively struck the heart of the most vital social criticism of modern times. Metal is not an intellectual response but an emotional response to a culture that is failing.
Thesis: metal subculture is distinct
from pop-culture. Pop culture reinforces the status-quo; metal subculture deconstructs it. Then steps on it, burns it, buries it, pisses on the grave and masturbates over the ashes. Do metalheads have something better in mind for the world? Not really; but death is better than submission. Where metal has "gone wrong" is not where it's gone too far, but where it hasn't gone far enough - abandoning the intuitive sense that "something's wrong
and it's pissing me off" and turning with its dick between its legs to embrace
pop-culture. In other words, "selling out". The fame and the paycheck are just too irresistable. All you have to do is contract AIDS!
So you have History, Philosophy, and then wrap it up with where metal has gone
(musically, artistically, intellectually) - Ulver, Manes, Godkiller come to mind [there are probably other broader examples] and what happens to metal heads when they "grow up". You have your list of releases as an appendix, each with a good concise summary. Bands that aren't worthwhile are best NOT MENTIONED. The point is not
to try and make a comparative study, but just to express the hit-and-miss genius of metal - to explain in more words what is meant by "Fuck Christ" and "LOL AIDS LOL".
At least, that's what I would do if _I_ were writing the book. You either need a strong thesis, or you need to package it with a free CD sampler and a couple of fold-out posters.