Few composers have enjoyed such critical acclaim--or longevity--as Jean Sibelius, who died in 1957 aged ninety-one. Always more than simply a Finnish national figure, an "apparition from the woods" as he ironically described himself, Sibelius's life spanned turbulent and tumultuous events, and his work is central to the story of late-nineteenth- and early-twentieth-century music. This book situates Sibelius within a rich interdisciplinary environment, paying attention to his relationship with architecture, literature, politics, and the visual arts. Drawing on the latest developments in Sibelius research, it is intended as an accessible and rewarding introduction for the general reader, and it also offers a fresh and provocative interpretation for those more familiar with his music.