ballroom vs barbershop

ballroom

verb
  • To take part in ballroom dancing. 

noun
  • A large room used for dancing and banquets. 

  • A type of elegant dance. 

barbershop

verb
  • To perform in the barbershop musical style. 

noun
  • The place of business of a barber; a store where a person (usually a male) can go to get a haircut. 

  • A style of a capella vocal music, sung in four-part harmony, typically by a quartet of men. 

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