What's the threshold you can copyright? 9 notes? 16? Why is that the threshold and not 8? I may not agree that it should be 8, but I don't see any rigorous or

What's the threshold you can copyright? 9 notes? 16? Why is that the threshold and not 8? I may not agree that it should be 8, but I don't see any rigorous or well-reasoned model here to explain why "you can copyright 8 notes" is a festering disease when it seems like people are not reasoning through why something should or shouldn't be copyrightable.