As the days passed they became more and more tired. A procession of doctors came to the monastery over a period of several months. They changed the monks’ diet and sleep patterns but the monks became more tired than ever. When the abbot called in Dr Tomatis in February 1967, Tomatis found 70 out of the 90 monks ‘slumping in their cells like wet dishrags’. He reintroduced their chanting immediately. By November, almost all of them had gone back to their normal activities, their prayer, their few hours of sleep, and their arduous work schedule. Principles of Sound Healing Entrainment The principle of entrainment explains how sound healing works. A harmonious sound projected at a person who is in a state of disharmony will eventually bring them into resonance with the harmonious sound. Our atoms, molecules, cells, glands and organs all have a vibrational frequency. Sounds from outside our body will stimulate sympathetic vibration in the molecules and cells of our body.