This document discusses genre theory and how genres are categorized. It provides several definitions and perspectives on genre from different scholars. Genres are categorized based on common elements but also evolve over time. Genres operate within industries, audiences and culture as a way to market products to audiences. Genres provide audiences with pleasures and allow them to make choices about what to consume. Music videos specifically aim to appeal to youth subcultures by reinforcing musical genres and promoting artists, while not needing to literally represent songs.