Jonathan Goldman's work introduces the reader to the magical world of sound, the extraordinary properties of which have been known since ancient times. The book tells about the specific art of overtonal singing, used in many mystical traditions for healing and self-improvement. Overtonal singing - the ability of a singer to produce two or more tones at the same time - is the key to understanding the unknown sides of existence and human nature. The author, a recognized master and teacher of vocal technique, does not limit himself to theory and reveals to the reader the secret of independent comprehension of ancient knowledge.