pep rally vs pep talk

pep rally

noun
  • A meeting or gathering for the purpose of instilling enthusiasm and motivation in attenders. 

  • An extracurricular school activity in which students gather to express support for the school sports team before a game. 

pep talk

noun
  • A rallying speech made to instill enthusiasm and boost confidence 

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