I think you're trying to be ridiculous, but lawsuits of that sort do come up periodically - accusations of composition theft that in practice are probably not theft and just the fact that there aren't THAT many unique note progressions you can put into a song, and it's not that odd for a composer to accidentally imitate something they heard a long time ago when picking one.
How does AI change the playing field here? Accidental infringement is a thing either way, and the creator should be careful to avoid accidental infringement regardless of whether they're using an AI to do the creation.
