instrumentalist vs rockstar

instrumentalist

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

  • An adherent of instrumentalism. 

rockstar

noun
  • A member of a rock band, or a solo artist in the genre, especially one with celebrity status. 

  • Any animal, plant, or other thing that is renowned amongst others of its type. 

  • A person who is renowned or revered in his or her field of accomplishment. 

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