And how much training and guiding did that take? It's not like they hit "generate" and the first try made some good music. This definitely took a ton of human guidance and curation.
Well, it's not really AI any more, it's more like a Beethoven Phrase Generator operated by a committee of Beethoven Music Appreciators. It's a cool thing and I'm also bullish on AI as a creative tool, but a lot of current offerings are great at small scales but fall apart on the larger structural level.
If you have an OpenAI account, try getting GPT-3 to write a short murder mystery, for example. GPT-3 is kinda good at dyadic and triadic interactions and even some kinds of story generation, but doesn't get the structural requirement of multiplying contradictions until a tipping point resulting in convergence (though I think LLMs can be taught that).