Strange, that one should feel major and minor as opposites. They both present the same face, now more joyous, now more serious; and a mere touch of the brush suffices to turn the one into the other. The passage from either to the other is easy and imperceptible; when it occurs frequently and swiftly, the two begin to shimmer and coalesce indistinguishably.--But when we recognize that major and minor form one Whole with a double meaning, and that the "four-and-twenty keys" are simply an elevenfold transposition of the original twain, we arrive unconstrainedly at a perception of the UNITY _of our system of keys_ [tonality]. The conceptions of "related" and "foreign" keys vanish, and with them the entire intricate theory of degrees and relations. _We possess one single key._ But it is of most meagre sort. * * * "Unity of the key-system." --"I suppose you mean that 'key' and 'key-system' are the sunbeam and its diffraction into colors?" No; that I can not mean. For our whole system of tone, key, and tonality, taken in its entirety, is only a part of a fraction of one diffracted ray from that Sun, "Music," in the empyrean of the "eternal harmony." * * * However deeply rooted the attachment to the habitual, and inertia, may be in the ways and nature of humankind, in equal measure are energy, and opposition to the existing order, characteristic of all that has life. Nature has her wiles, and persuades man, obstinately opposed though he be to progress and change; Nature progresses continually and changes unremittingly, but with so even and unnoticeable movement that men perceive only quiescence. Only on looking backward from a distance do they note with astonishment that they have been deceived. The Reformer of any given period excites irritation for the reason that his changes find men unprepared, and, above all, because these changes are appreciable. The Reformer, in comparison with Nature, is undiplomatic; and, as a wholly logical consequence, his changes do not win general acceptance until Time, with subtle, imperceptible advance, has bridged over the leap of the self-assured leader. Yet we find cases in which the reformer marched abreast of the times, while the rest fell behind. And then they have to be forced and lashed to take the leap across the passage they have missed. I believe that the major-and-minor key with its transpositional relations, our "twelve-semitone system," exhibits such a case of falling behind. * * *