I've reorganized my cards a few times and each time I add new categories.  The guiding question for deciding whether or not to create a category, which also helps me decide which category to assign a card that could fit into two or more sections, is this: 

What about this dance would cause me to include or avoid it at a particular point in my program?

For glossary dances, I might be looking for a dance that progresses with a California twirl because the last dance I called progressed with a star.  I like to include Petronella- and Rory O'More-inspired dances in most of my programs, so I go looking for dances with those, regardless of how they progress.

I recommend asking this question of your own programming choices and let that inform your card organization system.