Any one who has heard _Tristan_ a few times will begin to notice that, despite the endless variety of the music, it possesses an odd homogeneity. After hearing it fifty or a hundred times one begins to feel it to be comparable--if such a comparison could be made--to an elaborate oration delivered in one breath. The whole thing, complete in every detail, must (one thinks) have come bodily into the composer's mind in one inconceivable moment of inspiration and insight. Of course we know it was not so. A god may think a world into being in that way: a mortal requires time and unflagging energy to produce a masterpiece. We know that Wagner incorporated his own studies in his masterpiece; we can see how theme is evolved from theme. But the unity is so complete that if some sketches were to come to light showing that the last form of some of the music was in existence before the portions from which it seems to be evolved, I should not be in the least surprised, so perfect is the unity, so inevitably does every note fall into its proper place to express the feeling of the occasion. I take it that when he drafted the words he had before him a prophetic shadow of what the music was to be; and when he came to compose, the uninterrupted white heat of inspiration and enormous cerebral energy and intellectual grip of his matter, and the boundless invention which provided that matter for him, so to speak, so that he had only to pick it up ready made, enabled him to make that more or less dim, prophetic shadow a living, concrete reality. Never, from the first bar to the last, does the inspiration fail him; there is not a phrase that says less, or says it less adequately than the situation demands, than he has led us to expect. Old Spohr, when he heard _Tannhäuser_, though his ears rebelled against the unaccustomed discords, spoke about the Olympian inspiration and energy he felt in the work; and this criticism--and very just and fine criticism it was: as just and fine as it was unexpected from an old-world musician such as Spohr--is equally applicable to _Tristan_. In its power and perfection it seems the handiwork of one of the gods. The very truth of every phrase, and the fulness of utterance with which every phrase expresses the emotion of the moment, has given rise to a common delusion or absurdity: that in the Wagnerian opera every phrase is evolved or developed out of the previous one. If Wagner ever thought of adopting such an insane procedure he would have been puzzled to know how and where to start. He might, perhaps, have evolved the first from the last, and thus got a perfect rounded whole--a serpent with its tail in its mouth. As a matter of prosaic, or poetical, fact, Wagner, in all his work, incessantly introduces fresh matter, and dozens of themes appear, are worked out, and disappear entirely.