When I was young and stupid, I also had this "hierarchical" of musicians - classical players were better than jazz players were better than rock players were better than etc. But that's a very flawed observation. There are very, very few musicians in this world who are able to create that true moment of universal beauty, that poetic moment that can communicate directly across culture and time, that speaks to both the moment AND the ages. And they aren't limited to one genre of music or to one culture.
Sure, different music calls for different skill sets. But to say that (for example) Segovia is better than Jimmy Raney is better than Steve Morse is better than Chet Atkins etc. just misses the point. Each of those musicians is or was involved in the music they were for much the same reason- that's what coalesced meaning from chaos for them, that's how they needed to express themselves. To say that one was better or worse because they only concentrated on the skill sets necessary for them to transcend the ordinary to express themselves in the way that was most important to them is just like saying apples are no good because they don't taste like bananas.
This.
Bonnie Rait and Jessye Norman are two of my favorite singers for the reasons Ed mentiones above. I'm pretty sure that Ms. Raitt would sound pretty funny singing Mahler songs in German, and that Ms. Norman would sound similarly out of place belting out "Good Man, Good Woman" in a duet with Delbert McClinton*. But in their own elements, they are voices of the gods.
I've heard a lot of horrible jazz, and a fair amount of great pop/rock music. Reverse this sentence and it remains true. It's not about what you're doing, but rather how you're doing it. In my opinion, being a snob about styles is missing the point entirely. If you're going to be a snob about something, better to live by the maxim that that you only spend your precious time on earth re-listening to music that moves you in some deep way regardless of what other people may think of it. And if you can do that, given that our precious time on earth is so limited, it would probably be better to continue doing that than to talk down music that doesn't meet that standard for you. In the end, it's all subjective after all... and for each of us, we are the only subject that really matters. As always, YMMV, and YMWCB.
* However, given the raw musical genius of both, I'm sure either or both could surprise me if they set their minds to it.
