#bass_part__bass  the lowest part in polyphonic music
  supertype:  part.tune__voice  the melody carried by a particular voice or instrument in polyphonic music; "he tried to sing the tenor part"
  subtype:  ground_bass  a short melody in the bass that is constantly repeated
  subtype:  thorough_bass__basso_continuo__bassocontinuo  a bass part written out in full and accompanied by figures for successive chords
  subtype:  figured_bass  a bass part in which the notes have numbers under them to indicate the chords to be played

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