ditty vs evensong

ditty

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

  • A short, simple verse or song. 

verb
  • To sing; to warble a little tune. 

evensong

noun
  • A religious service, most commonly seen in the Anglican or Episcopal Church, that takes place in the early hours of the evening; originally, and sometimes still, an alternative name for vespers or a service combining vespers and compline. 

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