diva vs instrumentalist

diva

noun
  • Any female celebrity, usually a well known singer or actress. 

  • A person who may be considered or who considers herself (or by extension himself) much more important than others, has high expectations of others and who is extremely demanding and fussy when it comes to personal privileges. 

instrumentalist

noun
  • One who plays a musical instrument, as distinguished from a vocalist. 

  • An adherent of instrumentalism. 

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