lyrics vs recitative

lyrics

noun
  • The words to a song (or other vocal music). 

recitative

noun
  • dialogue, in an opera etc, that, rather than being sung as an aria, is reproduced with the rhythms of normal speech, often with simple musical accompaniment or harpsichord continuo, serving to expound the plot 

adj
  • of a recital 

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