diddley bow vs jazz band

diddley bow

noun
  • A one-stringed instrument (monochord) that consists of a wire string attached to something solid like the side of a house, and played with a piece of metal or glass, originating in the African American traditional music of Mississippi in the United States. 

jazz band

noun
  • A musical band that plays jazz music. 

  • A children's marching band, often using kazoos. 

How often have the words diddley bow and jazz band occurred in a corpus of books? (source: Google Ngram Viewer )