discord vs harmony

discord

noun
  • An inharmonious combination of simultaneously sounded tones; a dissonance. 

  • Any harsh noise, or confused mingling of sounds. 

  • Tension or strife resulting from a lack of agreement; dissension. 

  • Lack of concord, agreement or harmony. 

verb
  • To untie things which are connected by a cord. 

harmony

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

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

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

  • The academic study of chords. 

  • Agreement or accord. 

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

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