On any given evening in Vienna there are more musical performances going on than slices of sticky orangey chocolate cake being wolfed down at the Café Sacher. Opera aficionados and admirers of musicals can avail themselves of concurrent offerings at the splendiferous Staatsoper, the folksy Volksoper, the cosy Kammeroper, the recherché Ronacher and Raimund theaters or the historically pre-eminent Theater {…}