bar line vs preparation

bar line

noun
  • A vertical line in musical notation used to separate two bars or measures. 

  • Synonym of crossline (“type of headline”) 

preparation

noun
  • Any of the objects placed between the strings of a prepared piano. 

  • The day before the Sabbath or other Jewish feast-day. 

  • A substance, especially a remedy, that is prepared. 

  • The state of being prepared; readiness. 

  • Devotional exercises introducing an office. 

  • The previous introduction, as an integral part of a chord, of a note continued into a succeeding dissonance. 

  • The act of preparing or getting ready. 

  • A part of any animal body preserved as a specimen. 

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