madrigal vs national anthem

madrigal

noun
  • A polyphonic song for about six voices, from 16th century Italy. 

  • A song for a small number of unaccompanied voices; from 13th century Italy. 

  • A short poem, often pastoral, and suitable to be set to music. 

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 madrigal and national anthem occurred in a corpus of books? (source: Google Ngram Viewer )