a swiss mathematician and music researcher, developed end of the seventies years from the connections of the harmony laws from the music area and frequency of the movements of the heavenly bodies the formula of the cosmic octave. With this formula he calculated the sound frequency of the earth, the moon, the planets and the sun.
Tuning forks with exactly these frequencys become used with health-supporting effect, for example, with the sound acupuncture, the Phonophorese.
You find more information on this subject and a source of supply for high-quality tuning forks in the frequency to Cousto on the Internet under www.planetware.de
There are also some information on this subject under Wikkipedia