Solfeggio frequencies make up the 6-tone scale believed to have been used in sacred music, including the glorious and well known Gregorian Chants. The chants as well as their special tones were believed to impart spiritual blessings and energies when sung in harmony. Each Solfeggio tone on the scale is comprised of a specific frequency that is required to balance your energy and keep your mind, body and spirit in perfect harmony.