The rediscovery of the ancient solfeggio frequencies set in movement a journey of exploration into the field of sound therapy. From the 1980s, biochemist Dr. Glen Reins carried out further investigation on sound frequencies, on the lookout in to the impact of sound waves about the human human body. https://listening-to-396-hz-frequ32197.blogdanica.com/32283243/not-known-details-about-third-octave-band-frequencies