a cappella vs telling

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. 

telling

noun
  • The act of narration. 

  • The disclosure of information. 

  • Ability to determine. 

adj
  • Having force, or having a marked effect; weighty, effective. 

  • Serving to convince. 

  • Revealing information; bearing significance. 

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