"___ Lied von der Erde" (Mahler work)

DAS

This German word meaning "the" begins the title of Mahler’s final completed symphonic work, often called a "song-symphony." Think of the definite article in German.

This clue references Gustav Mahler’s famous symphonic song cycle "Das Lied von der Erde" ("The Song of the Earth"). The blank asks for the German definite article that starts the title, which is "Das." Since the clue provides the rest of the title in quotes, you just need the first word to complete it.