Music, like painting, makes use of materials which have the property of liberating this or that property from the surrounding medium and so suggesting an image. The instruments in music perform this part, as color does in painting.
Music is at once a science and an art. It is rooted in physics and mathematics, hence it is a science; inspiration makes it an art, unconsciously utilizing the theorems of science. It is founded in physics by the very nature of the matter it works on. Sound is air in motion. The air is formed of constituents which, in us, no doubt, meet with analogous elements that respond to them, sympathize, and magnify them by the power of the mind.