concert vs meeting of the minds

concert

noun
  • Agreement in a design or plan; union formed by mutual communication of opinions and views; accordance in a scheme; harmony; simultaneous action. 

  • A musical entertainment in which several voices or instruments take part. 

  • Musical accordance or harmony; concord. 

verb
  • To act in harmony or conjunction; to form combined plans. 

  • To plan; to devise; to arrange. 

  • To plan together; to settle or adjust by conference, agreement, or consultation. 

meeting of the minds

noun
  • An agreement, especially one resulting from a gathering in which discussion or negotiation took place. 

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