Norman Lebrecht, in his latest book Why Mahler?, presents a highly original interpretation of how a composer, discarded for decades, has risen to challenge Beethoven at the centre of concert culture. What is it about Mahler, he asks, that makes him feel more a man of our 21st century than of his own times. Using psychological, cultural and musical analysis, Mr Lebrecht presents a portrait of a great composer wrestling with being an outsider - and how he invented the tools to deal with it.