Bonzo3Legs, like many pontificators on folk music, tends to confuse4 rule making with describing something. To say that zebras have black and white stripes is not a rule made by the animal police. It is a decription of the animnals.If I say that Irish traditional players play a lot of jigs and reels, but Bavarians play more polkas and waltzes, is a description of their behaviour. It is not a rule that I am making that I wish them to follow.
See the difference?