Being a bit of a smart-ass - the "stiff" tutu is called classical, the softer one is the romantic tutu. The ballets they're used in are classified as the same, eg, Giselle is considered a romantic ballet, Swan Lake, a classical one. As for the rest, if ice dancers are encouraged to use ballet, I haven't heard it and I kind of hope D/W don't use a ballet next season. Giselle was fantastic and it was different from the ballets previously used by other ice dancers but I feel that's kind of done and done. And I agree that ballet music is a very common choice of music for skaters! And while Sylvia might have nice costumes, I'm not sure the story wouldn't translate well onto the ice.