You're assuming the only possible world is one in which musicians selling music is a viable business model. But the reality is that there are infinite business

You're assuming the only possible world is one in which musicians selling music is a viable business model. But the reality is that there are infinite business models that simply don't work, and it's perfectly fine. There was a time before you could copyright music and people still made music. That was perfectly fine, too. It's likely that there'd be a much stronger market around live performances and experiences, remixes, and lots of other stuff that's hard to imagine. I think you're neglecting to consider the complexity and self-organizational nature of markets. We don't really need a higher power to artificially create and protect specific jobs, especially around the arts.