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Without sounding too nerdy - music doesn't have soul, brains apply the "soulful" property inside itself to aesthetic signals where it makes sense to do so. Music like all other sensory stimuli is purely aesthetic and lacks depth, it's the brain that connects the dots and fabricates the story, and in that sense an AI's output can have many different possible stories. Personally I really like artificial and alien music and art, and it can for example make us more aware of peoples place in the universe and our environment and the future, and connect the brain to novel atmospheres and ideas. This notion of a guy playing a guitar being the only thing that's music is very outdated to me and not interesting at all.

And yes - musicians use accidents both digitally but even in the acoustic world all the time, that suddenly makes for interesting listening. Music has never been 100% human.

And the last point is if you want computers to be able to fabricate the stories themselves, and maybe create output that tells or "exploits" such a story, then yes maybe it isn't a human story, or maybe they can emulate our story, but in the end we come down to what is consciousness, what is intelligence, and all of this. But if intelligence can be artificial similar to humans, then AI's can in theory create vast and amazingly intricate stories that would be even more fascinating than what a human could come up with.