Phase - my understanding is that rap came from what we'd more than likely call disco, funk, and soul - and we can at least say that the latter two required skill and talent. James Brown pulled the same stunts, and he was far from lacking in talent. I don't like rap, and I don't think the 'gangsta' wannabes have anything in the way of musical sensibility, but I can't stretch it that far. I don't know too much about the 'talent', as far as melodic singing, of early death vocalists - and I'm going to call a well-hidden bluff and say that I don't think you do either - but I do know that even the short snippets of "Bow to me faithfully, bow to me splendidly" suggest that David Vincent knew what he was doing with his voice, Cynic's Focus had some - while vocoderized - well-managed clean vocals, and plenty of bootlegs floating around suggest that Paul could handle himself well, Mikael Stanne of Dark Tranquillity threw around some great clean vocals... hmm.
I have to completely disagree that it's harder to find a melodic singer than a *good* growler - anyone classically trained or otherwise well-practiced can hold their own with a little familiarity with the music, and singing is a natural extension of the speaking done from months after birth, while death vocals are an entirely different discipline taking possibly as much control over breathing and throat control. Hell, come down to Austin or San Antonio and check out the classic rock throwbacks, those guys can belt - and then turn around and find me as many *good* grunters as you saw melodic singers. Bullshit. If you're talking about finding the man himself, yes, it'll be hard, but if you're looking for singers who can keep in tune and have a good range and tone, you're stretching it a bit.
Oh, and it's 'accepting'. Not 'excepting' - that would imply making an exception of something, which is the opposite of what you're trying to say. I'm just obsessive-compulsive, don't take it personally; spelling and improper word choice (too/two/to, accept/except, affect/effect, et cetera) drive me nuts.
Ben, I've wondered that too - but I'd be frightened if she could go from sounding like a pre-kindergarten teacher to a grizzly bear. I see it as being much more useful that she can use knowledge of anatomy - which I doubt Barney Greenway has - to explain how things *should* work. It would be much more helpful to anyone to have someone who may not scream but understands how it's done (which can be done from studying screamers, studying bears roaring, studying dogs barking, et cetera) than to have some well-known guy who you can't even understand and who has no idea what the hell he's doing himself trying to say 'well, you talk like this, and you growl like THIS, cholly ho'. To bring in a guitarist example, try watching an 80s 'instructional' video with a then-popular shredder playing lick after lick without understanding what he's doing, and then go to a jazz instructor who doesn't tear the fretboard up himself but who can pick apart technique flaws from a mile away at any speed. One will be useless, the other will make you a better player.
Jeff