attune vs level set

attune

verb
  • To bring into harmony or accord. 

  • To tune (an instrument). 

  • To bring into musical accord. 

level set

verb
  • To establish a baseline of mutual understanding 

noun
  • An event consisting of level setting 

  • The set of values x for which a real-valued function f(x) is equal to a given constant. 

  • A state of mutual understanding among parties 

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