As Wagner's "Ring Cycle" arrives at the Metropolitan Opera this week critics contend that it's the ultimate in long, boring and bombastic music drama. But Wagner fans (or "Ringheads") argue that few composers pack in more thrilling songs, glorious orchestral passages, and big ideas -- and the rewards for the listener are plenty. We debate Wagner's biggest achievement with Norman Lebrecht, music critic of London's Evening Standard; and Anne Midgette, chief classical music critic of the Washington Post.