On June 6 , he wrote to his sister that he was to conduct the premiere of Mahler 's Das Lied von der Erde ; he did so in Munich on November 20 , 1911 , in the first half of an all-Mahler concert ( the second half contained Mahler 's Symphony No. 2 ( Mahler ) ) .
A few months after Mahler 's death in 1911 , Walter led the first performance of Das Lied von der Erde in Munich , as well as Mahler 's Symphony No. 9 in Vienna the next year .