For the May 2009 complete cycle of Mahler symphonies performed at Carnegie Hall, Daniel Barenboim and Pierre Boulez were invited to conduct. But it was Leonard Bernstein who famously first rescued Mahler's majestic symphonies from cult status and lifted them into the classical mainstream. These landmark recordings still stand as the definitive Mahler-symphony cycle; along with the complete Symphonies Nos. 1-9 ; Adagio from Symphony No. 10 , and Las Lied Von Der Erde , this 12-disc set brings to CD for the first time a long-unavailable 1967 audio documentary: Gustav Mahler Remembered: Reminiscences by Mahler's Associates and by Musicians Who Played Under His Baton . Two classical heroes honored in one sprawling set!