ditty vs doxology

ditty

noun
  • A short, simple verse or song. 

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

verb
  • To sing; to warble a little tune. 

doxology

noun
  • An expression of praise to God, especially a short hymn sung as part of a Christian worship service. 

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