Act I. Entrance to Hades. When Orpheus appears, he is greeted with threats by the Furies. The scene, beginning with the chorus, "Who is this mortal?" is still considered a masterpiece of dramatic music. The Furies call upon Cerberus, the triple-headed dog monster that guards the entrance to the Nether World, to tear in pieces the mortal who so daringly approaches. The bark of the monster is reproduced in the score. This effect, however, while interesting, is but a minor incident. What lifts the scene to its thrilling climax is the infuriated "No!" which is hurled at Orpheus by the dwellers at the entrance to Hades, when, having recourse to song, he tells of his love for Eurydice and his grief over her death and begs to be allowed to seek her. He voices his plea in the air, "A thousand griefs, threatening shades." The sweetness of his music wins the sympathy of the Furies. They allow him to enter the Valley of the Blest, a beautiful spot where the good spirits in Hades find rest. (Song for Eurydice and her companions, "In this tranquil and lovely abode of the blest.") Orpheus comes seeking Eurydice. His recitative, "What pure light!" is answered by a chorus of happy shades, "Sweet singer, you are welcome." To him they bring the lovely Eurydice. Orpheus, beside himself with joy, but remembering the warning of Amor, takes his bride by the hand and, with averted gaze, leads her from the vale.

She cannot understand his action. He seeks to soothe her injured feelings. (Duet: "On my faith relying.") But his efforts are vain; nor can he offer her any explanation, for he has also been forbidden to make known to her the reason for his apparent indifference.

Act III. A wood. Orpheus, still under the prohibition imposed by the gods, has released the hand of his bride and is hurrying on in advance of her urging her to follow. She, still not comprehending why he does not even cast a glance upon her, protests that without his love she prefers to die.

Orpheus, no longer able to resist the appeal of his beloved bride, forgets the warning of Amor. He turns and passionately clasps Eurydice in his arms. Immediately she dies.

It is then that Orpheus intones the lament, "Che farò senza Euridice" (I have lost my Eurydice), that air in the score which has truly become immortal and by which Gluck, when the opera as a whole shall have disappeared from the stage, will still be remembered.

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"All forms of language have been exhausted to praise the stupor of grief, the passion, the despair expressed in this sublime number," says a writer in the Clément and Larousse Dictionnaire des Opéras. It is equalled only by the lines of Virgil:

Vox ipsa et frigida lingua,
"Ah! miseram Eurydicen," anima fugiente, vocabat;
"Eurydicen;" toto referabant flumine ripae.
[E'en then his trembling tongue invok'd his bride;
With his last voice, "Eurydice," he cried,
"Eurydice," the rocks and river banks replied.
Dryden.]

In fact it is so beautiful that Amor, affected by the grief of Orpheus appears to him, touches Eurydice and restores her to life and to her husband's arms.