Norwegian pianist Leif Ove Andsnes embarks on his Proms cycle of Beethoven piano concertos, directing the dynamic Mahler Chamber Orchestra. Each concert features a work by Stravinsky (in this case the composer’s classically inspired ballet Apollon musagète (‘Apollo, Leader of the Muses’) – music, the impresario Diaghilev claimed, ‘not of this world, but of somewhere above’.