bagpipes vs chanter

bagpipes

noun
  • A musical wind instrument of Celtic origin, possessing a flexible bag inflated by bellows, a double-reed melody pipe and up to four drone pipes; any aerophone that produces sound using air from a reservoir to vibrate enclosed reeds. 

chanter

noun
  • The pipe of a bagpipe on which the melody is played. 

  • One who chants or sings. 

  • A priest who sings in a chantry. 

  • The hedge sparrow. 

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