a cappella vs song and dance

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. 

song and dance

noun
  • Used other than figuratively or idiomatically: see song, and, dance. 

  • An excessively elaborate story or excuse used to justify something. 

  • An excessively complex set of instructions. 

  • A display of unnecessary excitement or activity. 

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