Garsington Opera, StokenchurchGerald Barry’s take on Wilde’s comedy is even wittier and zanier in Jack Furness’s hyperactive staging – complete with a grand piano on stilts, a herd of cows and a kangaroo that meets a grisly endAnyone who has seen the opera before will recognise the tall rack of white dinner plates, stacked and primed for you-know-what. Anyone who knows Oscar Wilde’s play will recognise its punchlines, transposed by composer Gerald Barry into a kind of staccato mashup between speech and singing. But in Jack Furness’s new production of Barry’s The Importance of Being Earnest for Garsington Opera, familiarity is otherwise avoided.Barry has already transformed Wilde’s “trivial comedy for serious people” into what he calls “an opera of delirium”. Singing offers another layer of perversity, orchestral scoring another source of wit, and stage business a further level of zaniness. Furness’s additions include a grand piano on stilts, a kangaroo that meets a nasty end, an enormo...