hurdy-gurdy vs piano accordion

hurdy-gurdy

noun
  • A stringed instrument that produces a droning sound by turning a handle that connects to a wheel that rubs against a rosined string, with a keyboard also used to alter the pitch of the string. 

  • A winch, a windlass. 

  • Synonym of street organ, often considered a misnomer. 

  • A water wheel with radial buckets, driven by the impact of a jet. 

adj
  • Sounding like the Swedish language. 

piano accordion

noun
  • an accordion with a keyboard similar to that of a piano 

How often have the words hurdy-gurdy and piano accordion occurred in a corpus of books? (source: Google Ngram Viewer )