In physics, sound is a vibration that typically propagates as an audible wave of pressure, through a transmission medium such as air, water or other materials.
In human physiology and psychology, sound is the reception of such waves and their perception by the brain. Humans can hear sound waves with frequencies between about 20 Hz and 20 kHz. Sound above 20 kHz is ultrasound and below 20 Hz is infrasound. Other animals have different hearing ranges.
Solfeggio frequencies make up the ancient 6-tone scale thought to have been used in sacred music, including the beautiful and well known Gregorian Chants. The chants and their special tones were believed to impart spiritual blessings when sung in harmony. Each Solfeggio tone is comprised of a frequency required to balance your energy and keep your body, mind and spirit in perfect harmony.
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