Opera can sometimes seem like an excuse for rich people to dress up and take a really fancy nap. And while the most moving of arias and fanciful costumes are worth the splurge, there's a whole lot of "what's happening" in between the breathtaking moments if you don't speak Italian. Or German. Or is it Elvish? Wagner's Das Rheingold, performed by the Dallas Opera in February, is part of the composer's four-opera Ring Cycle series. The Dallas Opera delivered the "visual magic" it aimed for with an inarguably spectacular production.