On Tuesday I went back to my old stomping ground, the Wiener Staatsoper, a return not particularly highly anticipated by me nor, I assume, by anyone else. With the Staatsoper you roll your dice and you take your chances—even the most formidable casts can be undone here by a total lack of rehearsal. But sometimes you get lucky (and not always at the performances with all the famous people). And despite having only one shot, this time I did.  This dark, dreamy Pelléas, a “new” production by Marco Arturo Marelli, is surprisingly worth seeing.