chorale vs national anthem

chorale

noun
  • A form of Lutheran or Protestant hymn tune. 

  • A chorus or choir. 

national anthem

noun
  • The official song of a constituent state of a country. 

  • The official song of a nation or sovereign state, generally of a patriotic nature and played at events to celebrate or honor said state. 

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