This document discusses genre theory in media. It defines genre as a category that media texts fall into based on conventions like plot, characters, and stylistic elements. Theories discussed include genres having subgenres and evolving over time (Grant, Neale), genres being used by industries to sell familiar codes and conventions to audiences (Mittell), and genres providing audiences pleasures like emotional response and decoding narratives (Altman). Music videos are given as an example of reinforcing elements of music genres to appeal to youth subcultures.