Hello, My brother is in the navy, involved with sonar technology, and he sent me the following web page. It lists different frequencies that affect the brain. It includes musical pitches but is not limited to those. It also includes frequencies well below and well above human perception. The list even lists different colors associated with different frequencies or pitches. http://www.lunarsight.com/freq.htm Maybe this might be of interest to some here on the lists. David Vanderhoofven Joplin, MO
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