With the use of Gongs, Tuning Forks, Crystal Bowls, Koshi Chimes and other percussions the mind and body are able to achieve deep healing and realxation.
Sound helps to facilitate shifts in our brainwave state by using entrainment. Entrainment synchronizes our fluctuating brainwaves by providing a stable frequency which the brainwave can attune to. By using rhythm and frequency, we can entrain our brainwaves and it then becomes possible to shift our normal beta state (normal waking consciousness) to alpha (relaxed consciousness), and even reach theta (meditative state) and delta (sleep; where internal healing can occur). This same concept is utilized in meditation by regulating the breath, but with sound it's the frequency that is the agent which influences the shift.