Genre Theories

Genre is a term that can be split up into different categories, based on characteristics that they share, for example, settings, storyline's, narratives, characters and themes. 
In particular, genre can be referred to Films, and they can be classified as being a particular genre, for example, Action, Horror and Thriler. 

Steve Neale states that 'genres are instances of repetition and difference' and 'genres are not systems, they are processes of systemisation'.
He also say's that, definitions of genre are historically relative and are therefore historically specific. Believed that there was a system of expectation and that by using own knowledge and applying conventions of the genre, the audience should be able to infer the narrative and storyline of the music video. He also declares that difference is essential to the economy of genre; mere repetition would not attract the audience.

While researching genre theories I found this prezi that outlines a few more genre theories.

http://prezi.com/az3nups9huvw/genre-theory/#

I also found this slideshare that describes genre theories in detail and states David Bordwell's theory as well as some other theories.

Genre theory from Andy Wallis