Ms. Masilo's "Swan Lake" is populated by a rowdy wedge of swans who have some fun with Tchaikovsky's sacred score, which also integrates bits of Steve Reich, African drumming and call and response. Ms. Masilo trades docility and romance for brash political theater: She bravely and buoyantly uses this ballet classic to address gender and homophobia in her native South Africa, which has one of the highest rates of AIDS in the world.