bebop vs ragtime

bebop

noun
  • An early form of modern jazz played by small groups and featuring driving rhythms and complex, often dissonant harmonies. 

verb
  • To participate in bebop jazz, such as by dancing in a way associated with the genre. 

  • To walk in an easygoing, carefree manner. 

ragtime

noun
  • A musical form having a rhythm characterized by strong syncopation in the melody with a regularly accented accompaniment. 

  • A piece of music in this style. 

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