choir vs sestet

choir

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

  • 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. 

verb
  • To sing in concert. 

sestet

noun
  • A piece of music composed for six voices or six instruments; a sextet or sestuor. 

  • The last six lines of a sonnet, forming two stanzas of three lines each. 

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