a cappella vs lilt

a cappella

noun
  • A vocal performance with no instrumental accompaniment. 

adv
  • In a manner of a choir with no instrumental accompaniment; literally, "in the style of the (Sistine) Chapel (in Rome)", such as a musical Mass done a cappella. 

adj
  • Singing solely or mainly without instrumental accompaniment. 

  • Related to a form of purely vocal music mostly associated with American college performance groups. 

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 a cappella and lilt occurred in a corpus of books? (source: Google Ngram Viewer )