Conductor Yannick Nézet-Séguin has described Mahler’s Tenth Symphony as ‘a piece like no other in the history of music’. It is both brutal and uplifting, astonishingly cathartic, a heart-wrenching farewell to the world, and to his beloved wife Alma – six of whose rarely heard but exquisite songs open tonight’s concert. The Symphony was completed after Mahler’s death by musicologist Derryck Cooke, who virtually dedicated his life to the remarkable work, but every movement is of Mahler’s own making.