But I wonder how many of the categories or genres have been created in a way that is almost arbitrary. Or is there some logic behind it? I'm not just talking about the 'folk' category.

My own tastes seem to transcend the whole 'category' system....yet there must be some factors that are common to all the music I like.   If that could be discovered, could a specific genre of 'stuff Larry likes' actually be created? Maybe we could do something like that for every music listener on earth.

Then we could do some kind of correlation or analysis----and invent some new 'genres'.

Just a thought.