have bats in one's belfry vs rhapsody

have bats in one's belfry

verb
  • To be crazy or eccentric. 

rhapsody

verb
  • To say (something) with exaggerated or rapturous enthusiasm. 

  • Followed by about, on, over, or upon: to speak with exaggerated or rapturous enthusiasm. 

noun
  • An exaggeratedly enthusiastic or exalted expression of feeling in speech or writing. 

  • An instrumental composition of irregular form, often incorporating improvisation. 

  • An epic poem, or part of one, suitable for uninterrupted recitation. 

How often have the words have bats in one's belfry and rhapsody occurred in a corpus of books? (source: Google Ngram Viewer )