With the production of the 'Ring' by Tankred Dorst last year, the 'Ring' productions looked back on a history of 130 years. 14 productions by 12 directors (only the brothers Wieland and Wolfgang Wagner staged two productions each) are proof of the inexhaustability of Richard Wagner's opera tetralogy. Again and again, great opera directors (after the Wagner family itself) have taken on the colossal challenge of a production: from Patrice Chéreau and Peter Hall to Harry Kupfer and Jürgen Flimm. Un...