Plot: Under the baton of Gianandrea Noseda, the BBC Philharmonic Orchestra launch a 75th anniversary tribute to the Russian ballet impresario Serge Diaghilev with a performance of Stravinsky's dazzling Firebird Suite. Plus the world premiere of John Casken's symphony Broken Consort and Ravel's exuberant G major piano concerto (soloist: Pierre-Laurent Aimard)