John Tavener's career has always been in the public eye. In the 1960s his music appeared on The Beatles' Apple label, and he was one of the youngest composers to be commissioned by the Royal Opera House. The Protecting Veil - the sensation of the 1989 Proms and one of the best-selling classical recordings of all time - made Tavener a household name and his Song for Athene was heard by millions around the world when it was played at Princess Diana's...