Euphony means harmony in sound. This definition not only indicates an acoustic fact, but above all the deep experience of Joy and Beauty within Sound in the human being as a whole.Euphony is a Science-Art that, through progressive stages, leads to experiencing the potentialities inborn in the human being; from the therapeutic effect of sound to the harmony within human relationships, from psychophysical relaxation to a re-discovery of intellectual vigour, from the expansion of sensibility to Self-knowledge.Daniel Levy's book deals with the effects of sound on the human being, offering a detailed analysis of the meaning and function of music, its great potential as a Science/Art, and the reasons why it is a golden key to the knowledge of ourselves and of the universe.