Think of this as a way to tag the class with relevant, applicable styles. Overlap is great, and as many styles as possible should be listed. Be specific, there is no rule as to what styles can be listed or not.
For example, the applicable styles for the class “Intro to Jazz for Dummies” would be:
Jazz, Blues, Swing, Ragtime, Dixieland, Big Band, Be Bop, Post Bop, Hard Bop, Smooth Jazz, Funk, Fusion, Jazz Rock, Rockabilly, Modern Jazz, Acid Jazz, Avant-Garde, Free Jazz, Latin Jazz, Bossa Nova