Dancers. Aren't they beautiful? Look at those fine legs and that grace... haaa... But don't be fooled. Behind the apparent beauty hides a vicious creature!
Of course I am joking, but playing for dancers is extremely challenging; and because their art is all about aesthetics and perfection, they can't be forgiving, neither for themselves, nor for you, foolish musician.
Accompanying dancers is all about regularity in the time, where you would normally use the time as a way to express feelings with slight fluctuations (play rubato).