Why does it matter?
Using genres is merely a way to organize art. As art grows, and new advancements are made, new genres come into existence. Genres form by conventions that change over time as new genres are invented and the use of old ones is discontinued.
Genre began as an absolute classification system for ancient Greek literature. Poetry, prose, and performance each had a specific and calculated style that related to the theme of the story. Speech patterns for comedy would not be appropriate for tragedy, and even actors were restricted to their genre under the assumption that a type of person could tell one type of story best. In later periods genres proliferated and developed in response to changes in audiences and creators. Genre became a dynamic tool to help the public make sense out of unpredictable art. Because art is often a response to a social state, in that people write/paint/sing/dance about what they know about, the use of genre as a tool must be able to adapt to changing meanings.
There's always been genres and sub-genres. We're just more aware of their existence now since information moves so quickly.
I'm mostly disturbed by the over-usage of the word 'recognized' in the first post.
All Fenders - All The Time 
