Over twenty-five years after his death in July 1989, the controversial Austrian conductor Herbert von Karajan remains an enigma. He was the most successful conductor in the history of classical music. Many of his recordings - of Italian opera, of Wagner and Richard Strauss, of Sibelius, Beethoven and Brahms - are treasured by music lovers around the world. Yet, even at the peak of his fame, his performances were variously criticised for being too opulent, too manicured, lacking warmth or spiritu...