liberal arts vs performing arts

liberal arts

noun
  • The academic course of instruction intended to provide general knowledge and usually comprising the arts, humanities, natural sciences, and social sciences, as opposed to professional or technical subjects. 

  • The trivium and the quadrivium. 

performing arts

noun
  • The arts involving performance, such as dance, theatre, music, etc. 

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