Baroque guitar vs classical guitar

Baroque guitar

noun
  • An archaic form of guitar with five strings, originating in the Baroque era, played by either strumming or plucking, and characterized by the use of re-entrant tuning. 

classical guitar

noun
  • A type of flat-tabled guitar of Spanish origin used primarily for Western classical music, flamenco, and Latin American music, with six nylon (formerly gut) strings, usually played with the fingers rather than with a plectrum. 

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