ditty vs incant

ditty

verb
  • To sing; to warble a little tune. 

noun
  • A saying or utterance, especially one that is short and frequently repeated. 

  • A short, simple verse or song. 

incant

verb
  • To state solemnly, to chant. 

  • To recite an incantation. 

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