alto saxophonist vs countertenor

alto saxophonist

noun
  • A person who plays the alto saxophone. 

countertenor

noun
  • a part or section performing a countermelody against the tenor or main part 

  • male singing voice far higher than the typical male vocal range 

  • adult male singer who uses head tone or falsetto to sing far higher than the typical male vocal range 

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