Earlier quoted context omitted.
Humans and computers are different. It’s perfectly reasonable to treat a human being listening to something and taking inspiration differently from a computer listening to everything ever recorded.
Why is it perfectly reasonable to discriminate against the computer? Would the same apply to someone - with equivalent photographic memory - who listens to a ton of music and is thus inspired?
Another difference is one of scale. We've seen this in other areas, like surveillance. A random security camera here and there, or a random street photographer here and there, most people didn't really find objectionable. Besides which, any captured photographs or video had to be manually inspected for persons of interest. But start surveilling everyone in public, all the time, and using technology to track everyone automatically, and it starts to seem like a different construct.
A human producer putting out material that another human learns from, quotes from, paraphrases from, builds new things based on... well, that still requires time and dedication on the part of the learner. And there will be a correspondingly limited amount of new derivative material based on what the "teacher" producer created. AI systems offer the possibility for effectively unlimited derivative material, produced at an unprecedented rate.
Existing copyright laws, and existing social norms around creation of "intellectual property", have been formed with humans in mind. Humans who operate at a human rate of production, and who learn with a human style of learning. Some maybe be more efficient than others, but not so drastically different in form as AI.