choir vs quintet

choir

noun
  • A group of people who sing together; a company of people who are trained to sing together. 

  • The part of a church where the choir assembles for song. 

  • One of the nine ranks or orders of angels. 

  • Set of strings (one per note) for a harpsichord. 

verb
  • To sing in concert. 

quintet

noun
  • A group of five musicians, fit to play such a piece of music together 

  • Any group of five members 

  • A composition (a type of chamber music) in five parts (typically each a singer or instrumentalist, sometimes several musicians) 

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