The Mystery Schools of Egypt, Greece, and Rome understood that vibration is the fundamental active force in the universe and developed specific chants and tones for healing the mind, body, and spirit and achieving altered states of consciousness. Overtone chanting--also called vocal harmonics--is the ability of the human voice to create two or more notes at the same time. Healing Sounds explains how to perform vocal harmonics and experience their transformative and curative powers. An internationally recognized master teacher, the author provides diverse examples of sound healing systems incorporating both mystical and medical traditions--from Tibetan monks' use of tantric harmonics to Dr. Alfred Tomatis' use of Gregorian chanting--and their capacity to affect us on all levels. With many easy-to-follow exercises, Healing Sounds is the first book to show from both the scientific and spiritual viewpoints how to use the transformative power of sound for healing on physical, emotional, mental, and spiritual levels.