madrigal vs psalmody

madrigal

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

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

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

psalmody

noun
  • The singing or the writing of psalms. 

  • A collection of psalms. 

verb
  • To celebrate in psalms. 

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