[youtube]http://www.youtube.com/watch?v=TSbOCfIh3HI[/youtube] There has been plenty of eulogizing and assessment of Maurice Sendak’s remarkable career, most of it focused (rightly so) on his wonderful books. While Sendak’s work in opera and ballet has been praised, I don’t feel that enough attention has been paid to the two operas he worked on with Oliver Knussen. The first, Where the Wild Things Are, is the best children’s opera of our time; the second, Higglety Pigglety Pop!, is one of the best late 20th-century operas of any type. Higglety Pigglety Pop! is a fairy tale with great appeal to children, yet the surreal story