Replacing a career path that most participants want to do (or at least claim to want to do) obsoletes the human race.
(...)
It's also understandable to replace humans in jobs where computers/robots can do it better and it matters. Soon robot surgeons will be the clear best choice.
But the arts? Why - aside from maximizing bullshit profits for faceless corporations - would we want to deprive the throngs of aspiring artists? Sure, sure, it someone's crap at it they should find a different job. But why are we even contemplating AI music when there's a nearly limitless supply of people who are quite talented but there isn't a slot for them in the money machine
I think you're contradicting yourself, and also being unintentionally insulting towards artists. You say surgeons should be replaced by AI because the work the surgeon does matter, but artists shouldn't - meaning that the artists' work doesn't really matter. You say this is how humanity can avoid obsolescence. Do you really think humanity will avoid obsolescence by ceding things that matter to AI and limiting itself to the trivial pursuits?
But there are other problems with your post. You say artists should be privileged, because they enjoy their work. Well, artists aren't the only ones that enjoy their work: many physicians have chosen their career from a sincere desire to help others. Yet, you say that the physician's enjoyment of his work doesn't matter, because AI can do a better job. Well, what if AI can do a better job than some, or most artists? Why shouldn't the AI be allowed to do so?
Also, you're seeing the issue from a single side: the side of the artists - the art producers. There are however two sides here: the producers of art, but also the consumers of art. You're saying consumers shouldn't be allowed access to AI art, because this would "deprive the throng of aspiring artists" who are somehow owed a living by the rest of humanity. You say regular people, non-artists, should be forced to support those aspiring artists, even if their production isn't as good as AI. This doesn't make sense to me.
Now, we can have a very inconclusive discussion about what "art" is, and whether whatever AI produces is "art", or whether it's missing some ineffable je ne sais quoi that human art has. I personally think that AI in art is just a tool. Somebody can use AI to create works that represent their vision or ideas, just like they can use a pencil or a brush. This person may lack the training or tools to materialize their vision using traditional means - but they can use AI to get over those limitations and create something. I don't believe this makes them less of an artist, just like I don't think a Photoshop artist is less of an artist because he doesn't use paint and canvas.