folk song vs lilt

folk song

noun
  • folk music 

  • A song, in any folk style, originating among ordinary people, usually non-professional musicians, and handed down by oral tradition. 

  • A song in the style of folk music, a modern genre of popular music. 

lilt

noun
  • A lively song or dance; a cheerful tune. 

  • A cheerful or melodious accent when speaking. 

  • Animated, brisk motion; spirited rhythm; sprightliness. 

verb
  • To utter with spirit, animation, or gaiety; to sing with spirit and liveliness. 

  • To sing cheerfully, especially in Gaelic. 

  • To do something rhythmically, with animation and quickness, usually of music. 

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