But is the idea of "content" really all that?
When I listen to a recording of a 18th century Danish fiddle tune, is it a bunch of notes and chords that can be imitated? Sure. And it can certainly be imitated by a professional human style imitator or an AI.
But I'm not just looking for a string of pleasant chords and tones to massage my feelings. The context is part of what it is. It's not really "content", it's communication. The guy who made it, wanted to say something. Something that was important to him, which he thought better put into music than into text. He's dead almost 300 years ago, but I want to hear what he wanted to say.
Which isn't to say there isn't room for AI-generated (or professional composer-generated) imitations. They're trained on the real stuff, it's the echo of real people we hear. But that's why it's valuable, not as generic "content".