Music may be divided into four classes, each class marking an advance in receptive power on the part of the listener and poetic subtlety on that of the composer. We may liken the first stage to that of the savage Indians who depict their exploits in war and peace on the rocks, fragments of bone, etc. If the painter has in mind, say, an elephant, he carves it so that its principal characteristics are vastly exaggerated. A god in such delineation is twice the size of the ordinary man, and so it is in descriptive music. For instance, in Beethoven's "Pastoral" symphony, the cuckoo is not a bird which mysteriously hides itself far away in a thicket, the sound of whose voice comes to one like a strange, abrupt call from the darkness of the forest; no, it is unmistakably a cuckoo, reminding one strangely of those equally advanced and extremely cheap art products of Nuremberg, made of pine wood, and furnished with a movable tail. The next stage is still a question of delineation; but of delineation that leads us into strange countries, and the sounds we hear are but the small door through which we pass. This music _suggests_; by way of example, the opening of the last movement of the "Pastoral" symphony, the march from Tchaikovsky's "Symphonie Pathetique," the opening of Raff's "Im Walde," and Goldmark's "Sakuntala." Such music hints, and there is a certain potency in its suggestion which makes us see things. These two divisions of music have been termed "programme" or "objective" music. The other two classes of music have been termed subjective. The first is declamation, pure and simple; the singer may be telling a lie, or his sentiment may be insincere or false; what these sounds stand for, we know from the words, their grade of passion, etc. The last phase of our art is much more subtle, and is not amenable to such accurate analysis. If we may liken music to painting, we may, I think, compare the latter to the first three stages of this new language of music; but it can go no further. For that art must touch its audience through a palpable delineation of something more or less material; whereas music is of the stuff dreams are made of. It is hardly necessary to say, however, that our dreams are often much more poignant than the actual sensations caused by real occurrences would be. And it is because of this strange quality, I think, that dreams and music affect us in much the same manner. The vital principle of Wagner's art was that he not only made startlingly vivid pictures in his music, but that he made the people in these pictures actually walk out of the frame and directly address the audience. In other words, his orchestra forms a kind of pictorial and psychological background from which his characters detach themselves and actually speak. If they speak falsely, the ever present orchestra, forming as it were a halo, unmercifully tears away the mask, like the mirror in old fairy tales.