Erik Tawaststjerna embarked on his monumental and acclaimed study of Jean Sibelius's life and music in 1960 and it occupied him for over a quarter of a century. His study differs from other work on the composer in one important respect: he had unrestricted access to the composer's papers, diaries and letters as well as the advantage of numerous conversations with the composer's widow and other members of the family. Thus his researches can justifiably claim to have thrown entirely fresh light on...