broken record vs litany

broken record

noun
  • Used other than figuratively or idiomatically: see broken, record. 

  • Someone or something that constantly repeats itself, causing annoyance. 

litany

noun
  • A prolonged or tedious list. 

  • A ritual liturgical prayer in which a series of prayers recited by a leader are alternated with responses from the congregation. 

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