Imagine an AI that generates songs. Imagine it generates millions of songs.
What are the odds some of those songs will accidentally and independently "copy" features deemed distinctive and commercially valuable in existing songs under copyright?
Is this deliberate creative copyright infringement surrounded by noise, or is it the result of an aggressively fast random search of a limited symbol space - and what is the difference?
Copyright law is going to have to change. It's either going to have to become irrelevant, or it's going to have to support hybrid not-quite-patent not-quite-copyright IP protection of generative/creative processes/personas, either manual or automated.