consistency vs harmony

consistency

noun
  • Correspondence or compatibility. 

  • Freedom from contradiction; the state of a system of axioms such that none of the propositions deduced from them are mutually contradictory. 

  • Reliability or uniformity; the quality of being consistent. 

  • The degree of viscosity of something. 

  • Local coherence. 

harmony

noun
  • Agreement or accord. 

  • A literary work which brings together or arranges systematically parallel passages of historians respecting the same events, and shows their agreement or consistency. 

  • A pleasing combination of elements, or arrangement of sounds. 

  • The relationship between two distinct musical pitches (musical pitches being frequencies of vibration which produce audible sound) played simultaneously. 

  • The academic study of chords. 

  • Two or more notes played simultaneously to produce a chord. 

How often have the words consistency and harmony occurred in a corpus of books? (source: Google Ngram Viewer )