I'm not entirely convinced by your argument. Some years ago there was an episode of the Gadget Show where they were testing an app for suggesting food ideas. I can't remember how it was supposed to work, it was too long ago, but it was something to do with having profiles of different food types programmed into it and then it used some sort of algorithm to compare taste profiles and come up with combinations that should work.

The combination it came up with that they then tried selling on a food stall was chocolate on pizza. It wasn't to everybody's taste but some liked it, with one describing it as "weirdly delicious".

It doesn't seem completely ridiculous that if an AI could be trained to recognise patterns of music that worked well together that it could analyse a large corpus of recorded music and come up with surprising mixes that you wouldn't think would work, but do.