The harmonic spectrum set is a full middle octave of 8 tuning forks (c,d,e,f,g,a,b,c) based on the pythagorean scale, also known as the just scale. The octave of tuning forks in this set is c through the next higher c. They are the traditional chakra frequencies from the hindu tradition with c being the root chakra, d the sacral chakra, etc.
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