‘Tis the season of summer stock, music festivals, and outdoor performances. For my own part, I took in Jacob’s Pillow in the Berkshires, one of the country’s preeminent dance festivals. While an amazing piece of dance can make everyone want to join in, there are some dances no one should mimic without authorization, at least not as part of a commercial “public performance,” as that term is defined by 17 U.S.C.… More