There are two definitions of worth or value that people conflate every time a discussion like this comes up. One is "produces happiness or utility." Another is, "marginal cost to create absent government regulation." It would be easier if people would just stop using the word "value" when making either claim, but that'll never happen. So you basically have to ask what people mean each time they say something.
For me, it's obvious that songs have people-enjoy-it-value. It's simultaneously obvious that it has no marginal-cost-to-produce-value. To the extent I believe that music will become more rare if it pays less well, then, I should support some manner of government regulation to protect the industry that produces it. (And, of course, there's the unstated assumption that people will generally not pay when they don't have to, which is also open to debate both on theoretical and empirical terms. And a bunch of other unstated moral assumptions that I'm not going to go into.)
For me, it's obvious that songs have people-enjoy-it-value. It's simultaneously obvious that it has no marginal-cost-to-produce-value. To the extent I believe that music will become more rare if it pays less well, then, I should support some manner of government regulation to protect the industry that produces it. (And, of course, there's the unstated assumption that people will generally not pay when they don't have to, which is also open to debate both on theoretical and empirical terms. And a bunch of other unstated moral assumptions that I'm not going to go into.)