Well, the question of genres can be rather complicatated, and it seem that personal preferences and opinions play a big part in it. I had my experiences with that over time, also because I tagged my MP3 collection with genres as a sorting criteria.
Sure, there are many tracks that can be clearly desihnated,, but often enough its very hard to decide. Music styles develope, combine existing styles or add new things to existing styles. And there is not even a "official institution" to create new genre names - so I made my own, of which I am the boss: the Beatminister. :) Its cool to be the boss - that way I'm always right, like the Pope... :)