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Which voices and instruments are used in Gustav Mahler’s Symphony No. 3?

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Gustav Mahler’s Symphony No. 3 is a large-scale work scored for a massive orchestra, which includes a variety of brass and woodwind instruments, such as trumpets and the post horn (or a modern French horn).1

In addition to the orchestra, the symphony incorporates human voices in the fourth and fifth movements:

Fourth movement: Features an alto solo.1
Fifth movement: Features an alto soloist accompanied by women’s and boys’ choruses.1