a cappella vs speech

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. 

speech

noun
  • A formal session of speaking, especially a long oral message given publicly by one person. 

  • The ability to speak; the faculty of uttering words or articulate sounds and vocalizations to communicate. 

  • Language used orally, rather than in writing. 

  • An utterance that is quoted; see direct speech, reported speech 

  • Public talk, news, gossip, rumour. 

  • The act of speaking, a certain style of it. 

  • A dialect, vernacular, or (dated) a language. 

verb
  • To make a speech; to harangue. 

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