polyphony vs sync

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. 

sync

noun
  • A music synchronization license, allowing the music to be synchronized with visual media such as films. 

  • Harmony. 

verb
  • To synchronize, especially in the senses of data synchronization, time synchronization, or synchronizing music with video. 

  • To flush all pending I/O operations to disk. 

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