Gustav Mahler’s Ninth Symphony shows the culmination of the composer’s career. The concert recorded in this landmark live performance was part of The Mahler Project, in which friends and conductors Daniel Barenboim and Pierre Boulez tackled all of Mahler’s symphonies with the Staatskapelle Berlin. A documentary from Christoph Engel accompanies the concert, in which a diverse selection of statements and conversations from both conductors is featured.