concerto vs fiction

concerto

noun
  • A piece of music for one or more solo instruments and orchestra. 

fiction

noun
  • Literary type using invented or imaginative writing, instead of real facts, usually written as prose. 

  • A verbal or written account that is not based on actual events (often intended to mislead). 

  • A legal fiction. 

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