#pure_tone__tone  a steady sound without overtones; "they tested his hearing with pure tones of different frequencies"
  supertype:  #auditory_sensation__sound  the subjective sensation of hearing something; "he strained to hear the faint sounds"
  subtype:  #harmonic  a tone that is a component of a complex sound
     subtype:  #fundamental_frequency__fundamentalfrequency__fundamental__first_harmonic__firstharmonic  the lowest tone of a harmonic series
     subtype:  #overtone.harmonic  a harmonic with a frequency that is a multiple of the fundamental frequency

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