That's a poster case for it being derivative works then. And of course, the more concentrated the input mixture the bigger the chance of some of that emotion leaking through.

I think there is a great case to be made here using purely synthetic sounds as the basis for emotion. Vangelis (Soil festivities), Klaus Doldinger (Skyscape) are great examples. These are sounds that have been produced exclusively by the mind and in spite of there not being a physical instrument involved they manage to convey imagery and emotion extremely effectively. This is technology used as an enabler. I've yet to come across someone using AI tech in the same liberating manner unlocking novel imaginary constructs in the way that those two did.