overture vs promo

overture

noun
  • An approach or proposal made to initiate communication, establish a relationship etc. 

  • A motion placed before a legislative body, such as the General Assembly of the Church of Scotland. 

  • A musical introduction to a piece of music, or a play. 

verb
  • To make overtures; to approach with a proposal. 

promo

noun
  • an interview or monologue intended to promote a character or an upcoming match. 

verb
  • To promote; to publicize. 

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