Of this year’s three musical birthday boys, Wagner has fared, in England, surprisingly well, Verdi inexplicably badly, and Britten, as was to be expected, has received the royal treatment. No one could have predicted, though, that the culmination of the celebrations would be as glorious as it was: a single semi-staged performance at the Barbican of what, in my minority opinion, is his operatic masterpiece, Albert Herring.