I'm not comfortable with categories, and I distrust most definitions. The word 'definition' is based on the word 'finite,' which would seem to indicate that once we've defined something, we don't need to think about it anymore.
If you wanna dance, a windshield wiper'll do it-all you need is a beat.
Dance music-as I keep saying, you can dance to a windshield wiper... a windshield wiper that's fairly steady gives you a beat and all you need is an out-of-tune playing 'Melancholy Baby' and you've got dance music.