concord vs harmonize

concord

verb
  • To agree; to act together 

noun
  • Agreement of words with one another, in gender, number, person or case. 

  • A state of agreement; harmony; union. 

  • An agreeable combination of tones simultaneously heard; a consonant chord; consonance; harmony. 

  • A variety of sweet American grape, with large dark blue (almost black) grapes in compact clusters; a Concord grape. 

harmonize

verb
  • To be in harmonious agreement. 

  • To bring things into harmony, or to make things compatible. 

  • To provide parts to. 

  • To provide the harmony for a melody. 

  • To play or sing in harmony. 

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