Are you kidding me? Music is way too broad for this sort of thing. This is like when people ask me who my favorite artist is - favorite what? Architect? Photographer? Comics artist? Painter? And even if you're only asking me for my favorite architect, that's a pretty broad field in itself - just as different media work with different senses, different sensibilities and movements both within and across media respond to different impulses, ideas and needs. Music is the entire spectrum of human creativity as applied to sound. I know that there are musicians I don't like and musicians I do, impulses I prefer, ideas I'm turned off by, but how am I to determine which comes out on top? Am I to define one static ideal, categorize every single artist in the medium I've ever responded in any significant way to in accordance to their proximity to that ideal, and form a hierarchy? That seems ridiculous to me - too one-dimensional. Art deals with human emotions, ideas, desires - it is a form of human interaction with the world, a creation of a small piece of the world that we may interact with that piece and with the world in relation to it. Human interaction with the world is uncertain, shifting; interaction with art must be uncertain and shifting as well. There can be no hierarchy.
Am I wasting my time here, ranting like this?
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"Bababadalgharaghtakamminarronnkonnbronntonneronntuonnthunntrovarrhounawnskawntoohoohoordenenthurnuk." - James Joyce