Seven Wagner operas are performed at the Proms, Aldeburgh and Covent Garden celebrate the Benjamin Britten centenary and Glyndebourne goes for French baroqueSongs from the Same EarthNine works commissioned by the Royal Philharmonic Society form part of the Benjamin Britten centenary celebrations at this year's Aldeburgh festival. Anticipated pieces come from Judith Weir, Poul Ruders, Magnus Lindberg and Wolfgang Rihm…