backstory vs song and dance

backstory

noun
  • A fictitious account of a person's history designed to conceal their actual history and motives. 

  • The previous life and experiences of a person, especially a character in a dramatic work, but also a real-life person. 

  • A prequel. 

song and dance

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

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

  • An excessively complex set of instructions. 

  • A display of unnecessary excitement or activity. 

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