level set vs symphony

level set

noun
  • A state of mutual understanding among parties 

  • 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. 

verb
  • To establish a baseline of mutual understanding 

symphony

noun
  • Harmony in music or colour, or a harmonious combination of elements. 

  • An instrumental introduction or termination to a vocal composition. 

  • An extended piece of music of sophisticated structure, usually for orchestra. 

  • A symphony orchestra. 

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