cacophony vs polyphony

cacophony

noun
  • A mix of discordant sounds; dissonance. 

polyphony

noun
  • Musical texture consisting of several independent melodic voices, as opposed to music with just one voice (monophony) or music with one dominant melodic voice accompanied by chords (homophony). 

  • The quality of a text of being capable of being read in more than one way. 

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