Sound.
§ 16. Sound shares with the lower senses the disadvantage of having no intrinsic spatial character; it, therefore, forms no part of the properly abstracted external world, and the pleasures of the ear cannot become, in the literal sense, qualities of things. But there is in sounds such an exquisite and continuous gradation in pitch, and such a measurable relation in length, that an object almost as complex and describable as the visible one can be built out of them. What gives spatial forms their value in description of the environment is the ease with which discriminations and comparisons can be made in spatial objects: they are measurable, while unspatial sensations commonly are not. But sounds are also measurable in their own category: they have comparable pitches and durations, and definite and recognizable combinations of those sensuous elements are as truly objects as chairs and tables. Not that a musical composition exists in any mystical way, as a portion of the music of the spheres, which no one is hearing; but that, for a critical philosophy, visible objects are also nothing but possibilities of sensation. The real world is merely the shadow of that assurance of eventual experience which accompanies sanity. This objectivity can accrue to any mental figment that has enough cohesion, content, and individuality to be describable and recognizable, and these qualities belong no less to audible than to spatial ideas.
There is, accordingly, some justification in Schopenhauer's speculative assertion that music repeats the entire world of sense, and is a parallel method of expression of the underlying substance, or will. The world of sound is certainly capable of infinite variety and, were our sense developed, of infinite extensions; and it has as much as the world of matter the power to interest us and to stir our emotions. It was therefore potentially as full of meaning. But it has proved the less serviceable and constant apparition; and, therefore, music, which builds with its materials, while the purest and most impressive of the arts, is the least human and instructive of them.
The pleasantness of sounds has a simple physical basis. All sensations are pleasant only between certain limits of intensity; but the ear can discriminate easily between noises, that in themselves are uninteresting, if not annoying, and notes, which have an unmistakable charm. A sound is a note if the pulsations of the air by which it is produced recur at regular intervals. If there is no regular recurrence of waves, it is a noise. The rapidity of these regular beats determines the pitch of tones. That quality or timbre by which one sound is distinguished from another of the same pitch and intensity is due to the different complications of waves in the air; the ability to discriminate the various waves in the vibrating air is, therefore, the condition of our finding music in it; for every wave has its period, and what we call a noise is a complication of notes too complex for our organs or our attention to decipher.
We find here, at the very threshold of our subject, a clear instance of a conflict of principles which appears everywhere in aesthetics, and is the source and explanation of many conflicts of taste. Since a note is heard when a set of regular vibrations can be discriminated in the chaos of sound, it appears that the perception and value of this artistic element depends on abstraction, on the omission from the field of attention, of all the elements which do not conform to a simple law. This may be called the principle of purity. But if it were, the only principle at work, there would be no music more beautiful than the tone of a tuning-fork. Such sounds, although delightful perhaps to a child, are soon tedious. The principle of purity must make some compromise with another principle, which we may call that of interest. The object must have enough variety and expression to hold our attention for a while, and to stir our nature widely.
As we are more acutely sensitive to results or to processes, we find the most agreeable effect nearer to one or to the other of these extremes of a tedious beauty or of an unbeautiful expressiveness. But these principles, as is clear, are not coordinate. The child who enjoys his rattle or his trumpet has aesthetic enjoyment, of however rude a kind; but the master of technique who should give a performance wholly without sensuous charm would be a gymnast and not a musician, and the author whose novels and poems should be merely expressive, and interesting only by their meaning and moral, would be a writer of history or philosophy, but not an artist. The principle of purity is therefore essential to aesthetic effect, but the principle of interest is subsidiary, and if appealed to alone would fail to produce beauty.
The distinction, however, is not absolute: for the simple sensation is itself interesting, and the complication, if it is appreciable by sense and does not require discursive thought to grasp it, is itself beautiful. There may be a work of art in which the sensuous materials are not pleasing, as a discourse without euphony, if the structure and expression give delight; and there may be an interesting object without perceived structure, like musical notes, or the blue sky. Perfection would, of course, lie in the union of elements all intrinsically beautiful, in forms also intrinsically so; but where this is impossible, different natures prefer to sacrifice one or the other advantage.
Colour.