All the trouble in the world, and all the disastrous results arising out of it, all come from lack of harmony. And this shows that the world needs harmony today more than ever before. So if the musician understands this, his customer is the whole world. When a person learns music, he need not necessarily learn to be a musician or to become a source of pleasure and joy to his fellow man; no, but by playing, loving, and hearing music, he must develop music in his personality. The true use of music is to become musical in one's thoughts, words, and actions. We must be able to give the harmony for which the soul yearns and longs every moment. All the tragedy in the world, in the individual and in the multitude, comes from lack of harmony. And harmony is best given by producing harmony in one's own life.