hat gives a revival of an operatic staple longevity? There are productions, like Barrie Kosky’s , perpetually in repertory at Oper Frankfurt, that are driven by choreography and could probably succeed with any cast of professional singers. Or the Zeffirelli at The Metropolitan Opera, that plays like a Disneyland ride with its charming sets and ebullient crowd scenes. And then there is Christoph Loy’s 2013 currently in revival at Oper Frankfurt (seen Oct. 3). Aesthetically ascetic and demanding of
