glee vs instrumental

glee

noun
  • An unaccompanied part song for three or more solo voices, not necessarily merry. 

  • Music; minstrelsy; entertainment. 

  • Joy; happiness; great delight, especially from one's own good fortune or from another's misfortune. 

verb
  • To sing a glee (unaccompanied part song). 

instrumental

noun
  • A composition written or performed without lyrics, sometimes using a lead instrument to replace vocals. 

  • The instrumental case. 

adj
  • Pertaining to, made by, or prepared for an instrument, especially a musical instrument (rather than the human voice). 

  • Applied to a case expressing means or agency, generally indicated in English by by or with with the objective. 

  • Serving as an instrument, medium, means, or agency. 

  • essential or central; of great importance or relevance. 

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