This question made me remember a question of my own.
I was told several times (even by girls who claimed they were musicians) that my dancing is very musical.
Now, I am not a specialist about music, or a dedicated dancer or anything. I am just a regular guy doing my best - as an occasional hobby. I am sure that just being on the beat is not musicality - but maybe just the first stone in the foundation of musicality.
So, long story short, what is musicality when evaluating a person's dancing?
Note: the way I understand it, musicality is different from playfulness, being unexpected, creative... But maybe it intersects with them?