How does Worlds of Music define “classical, “popular, “and “folk” music?

What will be an ideal response?

• "Most often they are deployed within societies to elevate certain musical practices for social and political reasons and to devalue others. . . . In this book, the authors emphasize music as human behavior. Of course categorizing musical practices and repertories as classical, folk, and so forth is itself meaningful human behavior, and it does affect how we conceive of music, but musical practices tend to thwart geographic and conceptual borders."
IV. Case Study: Podhale, Polish Tatra Region