In Fux's counterpoint treatise he constantly refers to the perfect and imperfect consonances. Is he referring to the degrees of the scale or relative intervals? For example, he says when moving from a perfect consonance to an imperfect consonance, does he mean moving from the 5th degree of the scale to the 3rd degree? or does he mean that the harmony being played is of a melody note and its fifth followed by another melody note and its third? I guess the latter wouldn't make much sense since the point of the treatise is to teach which note to be used in harmony. But anyway, what exactly is he referring to as the perfect and imperfect consonance?
