Begun between July and September 1910 in Toblach, Mahler’s Symphony No. 10 remained a fragment; however, the surviving manuscript provides indications of the composition’s form and content. The autograph sketch lays out all the symphony’s essentials and all five movements are present in the short score.

The first movement, an adagio, and the third, called Purgatorio, were premiered on 12 October 1924 by Franz Schalk at the Vienna State Opera; Ernst Krenek had prepared and completed the musica...