hard rock vs hymn

hard rock

noun
  • A rock music genre marked by a heavy regular beat, high amplification, and usually frenzied performances. 

hymn

noun
  • A song of praise or worship, especially a religious one. 

verb
  • To praise or extol in hymns. 

  • To sing a hymn. 

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