Jerry mentioned dances. Even experienced dancers vary in how much novelty they want in an evening. And a dance can be done to death too - in the 80s it was Levi Jackson or K&E at every dance. Now K&E is new to many, 'not done that for ages' to others. I like a dance (or a chorus song) that I can relax and enjoy, dance, rather than think too hard all the time, as well as something with an interesting new figure or combination. So whoever I'm calling for I try to give a mix of old & new, easy and testing (though the programme itself will vary widely depending on the dancers).