Gustav Mahler's Sixth Symphony is perhaps the darkest work he ever wrote-it's nickname is "The Tragic." And there is something almost destructive about the final movement. "But strangely enough," says Simon Rattle, "it is also a very classical symphony. Yes, it is extreme, but for long stretches it is less wild than other works of his-although of course it does convey a harrowing message. But it's like a lot of great works: there are always different ways of reading them. I've been conducting the Sixth for forty years now, and over time I've come to realise that it also contains hope."Mahler composed his Sixth Symphony during the summers of 1903 and 1904 at his "composer's cottage" in Maiernigg, near Klagenfurt. At the Vienna performance in 1907 (the third under his baton), he called it the "Tragic Symphony"-a nickname that soon became the stuff of legend. In particular, the darkness and devastating hopelessness of the finale-written at a time when he was at the high point of his life, both professionally and personally-are puzzling. Even his wife Alma could not quite explain the contradiction. As always, it was in and through music that Mahler came to terms with his experiences, exploring themes such as farewell, the meaning of existence, death, redemption, the afterlife, and love.More than other Mahler works, the Sixth Symphony is committed to "classical" symphonic form: it is in four movements and has no vocal parts. Despite all the liberties it takes, the opening movement follows sonata form. The Andante draws on the rondo form, as do the Scherzo and the Finale. Very unusually, even the Scherzo has march-like features and seems like a parodistic paraphrase of the opening, with a change of perspective. The march, which sets the tone from the very first note of the first movement, plays a major role.