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Our inability to waver the opinion of diehard Kenny G fans is not a function of "weak" arguing.
Well I'm definitely not saying the argument is weak, just silly, and not particularly healthy.
For better or worse I don't own any of Kenny G's work. Incidently if Kenny G were doing a South Park type of parody of Armstrong with all kinds of sound effects, or calling him Uncle F-er, or something, then that's clearly a different story, but the argument is that G is barely enough of a virtuoso to be called a jazz musician and definitely not enough to cover a great jazz artist's work (though not even knowing what the artist himself would think about the cover) is itself not a good idea for jazz.
I understand that virtuosity is important especially for jazz, but it's not, nor has it ever been, the driving force behind jazz. So framing virtuosity as the prime mover in jazz really is the wrong argument and potentially a very dangerous argument to try and make. The reason is relevance. Rightly or wrongly jazz has always gained its relevance because of popular music and popular culture, not in spite of popular culture or popular music and certainly not on its own virtuosity (cough- Jeff Berlin). That may be a painful realization for some, but it's the truth.
Whatever you may think about popular culture, and I think there are some pretty disgusting things going on in PC today, for example an entire army of small businesses here in LA built upon following Brittany Spears around town, it still remains the single most powerful vehicle jazz artists can use to communicate in their art-form. Sure there are lots of other things in the bus, but one big thing is contemporary life, and without engaging contemporary life you put a noose around your neck (talk to a classical musician).
The only gauges that musicians have at the moment to see if they are connecting with contemporary life are record sales and/or concerts. If people are buying the music then you know that you are connecting with something inside popular culture on some level, and you remain relevant. But when you reject that, you stop being relevant, and a few things happen, none of them are good. If you are not relevant, sure you will have built an audience to that point who by definition will be aging, but it's going to be a lot harder to try and convince your audience that the work you do is meaningful. The result is that the financial ability to carry the art forward starts to slip. Two big problems.
But lying just behind these two immediate problems- the aging audience and a tightening financial noose—are two much more basic, much longer term but more crucial problems. First you get a drift away from jazz in the culture all around us, BUT Metheny's argument compounds that from within the jazz world itself which results in something very like stagnation, because he has built an artificial barrier to engaging contemporary life. Metheny in fact professes an absolute refusal to engage the outside world unless this barrier is met, for fear of "dumbing down" or contaminating the art-form. That's what makes this a line of thought a silly idea.
Obviously the two—both of them very long-term trends—are tied to each other. If people lose interest in jazz music because it's not relevant to them, and the jazz world refuses to engage with them because they are not "smart enough", then of course they lose interest even more, and the jazz world finds contempt for them even more and it's even harder to engage. And so it goes. Metheny is all too willing to provide us with half of the equation, and I don't see how that's healthy for jazz. Kenny G is engaging the world, having an impact, and carrying jazz into contemporary life. If you don't like that impact then you need to make a bigger impact on contemorary life which will be carried back into jazz, and not try and do it artifically the other way around.