chanter vs singer-songwriter

chanter

noun
  • One who chants or sings. 

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

  • A priest who sings in a chantry. 

  • The hedge sparrow. 

singer-songwriter

noun
  • A musician who both sings and composes, especially when recording or performing his/her own compositions. 

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