The influence of sounds on the psyche and body of humans has been known since ancient times. This volume describes and explains these influences in a comprehensive system. The author provides insights into the structure and function of the brain, thereby enhancing the understanding of its conscious and subconscious capabilities. Based on this foundation, the complex effects of music on humans and their emotions are explained. A layered model of personality illustrates ways in which the healing effects of music can be utilized. The book is aimed at doctors, psychologists, music therapists, and students in these fields, as well as interested laypeople. Footnotes directly clarify the scientific terminology, making the reading easier. A detailed subject index also makes the book a reference work.