Because that is copyright. You own what you create and get to decide what happens to it.
Apply what you said to books for example… it’s silly, no? Something may take years to research or dream up… it’s work, and it’s worth money. It’s often even harder earned than someone just doing what someone else tells them to from 9 to 5. Condensing it into a short form and fixating it in some way (recording it, printing it), takes time and thought, too. That’s additional work. Worth even more.
And the same goes for music. Music is not just playing an instrument and recording it. In your logic, a DJ scratching a bit and shouting silly shit into the microphone deserves to get paid for the evening, while the people who made the records he plays don’t?? No way! I’d rather just have recorded tunes that rock, even with a gap inbetween, and have the money go to the people who actually made the music.
A radio drama takes work to create, the actors want to get paid and they repeat the stuff over and over until it’s as close to what the director wants to express as they can feasibly get… and people can listen to it when and with whom they want… I think that’s actually worth more than performances!
But that doesn’t even matter. Copyright just means you create it, you own it, and what’s wrong with that? It’s not just something evil the music industry invented… it also means someone can’t take my photos or music and use them to promote something I don’t approve of, not to mention make money off them without my consent.
It’s not just the RIAA going after Napster users, it’s more complex than that, and copyright itself is not and never was the problem. The problem is the weight of the advertising industry choking independent artists. The problem is people buying that shit and having televisions. That needs to go away, not copyright.
Otherwise you’re simply killing “thinking up something alone and really concentrating”, and are restricted to “performing in front of an audience with a bit of practice beforehand”. And that would suck. Many, many of the things I cherish lots were never performed live.