Genre theory proposes that genres have codes and conventions that define them. A genre refers to a type of media content, like music videos, that audiences can recognize based on consistent characteristics. Genres evolve over time as conventions change through agreements between creators and audiences. Music video theorists have identified common elements of genres, like R&B, that help classify a video, such as its visual style, themes, and relationship between music and visuals. Audiences are familiar with genre conventions and can easily identify a genre based on its adherence to typical codes.