cattle call vs session

cattle call

noun
  • An audition which is open to the public and thus draws a large number of applicants, many of whom are inexperienced. 

session

verb
  • To hold or participate in a jam session with other musicians. 

noun
  • Any of the three scheduled two hour playing sessions, from the start of play to lunch, from lunch to tea and from tea to the close of play. 

  • A period devoted to a particular activity, e.g. the annual or semiannual periods of a legislative body (that together comprise the legislative term) whose individual meetings are also called sessions. 

  • A meeting of a council, court, school, or legislative body to conduct its business. 

  • The sequence of interactions between client and server, or between user and system; the period during which a user is logged in or connected. 

  • An extended period of drinking, typically consuming beer with low alcohol content. 

  • An academic term 

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