baritone vs basso

baritone

noun
  • The male voice between tenor and bass 

  • a brass instrument similar to the euphonium, but with a cylindrical bore instead of a conical one; a baritone saxhorn 

  • The musical range between tenor and bass 

  • A person, instrument, or group that performs in the range between tenor and bass 

basso

noun
  • A bass singer, especially in opera. 

  • The double bass, or contrabasso. 

  • An instrumental part written for a bass instrument. 

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