Answer:
Apollo gave his son Orpheus a lyre and taught him how to play. It had been said that "nothing could resist Orpheus's beautiful melodies, neither enemies nor beasts." Orpheus fell in love with Eurydice, a woman of beauty and grace, whom he married and lived happily with for a short time. However, when Hymen had been called to bless the marriage, he predicted that their perfection was not meant to last.
A short time after this prophecy, Eurydice had been wandering in the forest with the Nymphs. In some versions of the story, Aristaeus, a shepherd, then saw her, was beguiled by her beauty, made advances towards her and began to chase her. Other versions of the story relate that Eurydice is merely dancing with the Nymphs. In any case, while fleeing or dancing, she was bitten by a snake and died instantly. Therefore, Orpheus sung his grief with his lyre and managed to move everything, living or not, in the world; both humans and gods learnt about his sorrow and grief.
At some point, Orpheus decided to descend to Hades to see his wife. Ovid's version of the myth does not explain this decision,[4] while other versions relate that the gods and nymphs[citation needed] or Apollo himself, Orpheus' father,[citation needed] suggest that he make this journey. Any other mortal would have died, but Orpheus, being protected by the gods, goes to Hades and arrives at the Stygian realm, passing by ghosts and souls of people unknown. He also managed to attract Cerberus, the three-headed dog, with a liking for his music. He later presented himself in front of the god of the Greek underworld, Hades (Pluto in Roman mythology), and his wife, Persephone.
Orpheus played his lyre, attracting Hades. Hades told Orpheus that he can take Eurydice with him but under one condition: she would have to follow him while walking out to the light from the caves of the underworld, but he should not look at her before coming out to the light or else he might lose her forever. If Orpheus is patient, he might have Eurydice as a normal woman again by his side.
Thinking it a simple task for a patient man like himself, Orpheus was delighted; he thanked the gods and left to ascend back into the world. Unable to hear Eurydice's footsteps, however, he began fearing the gods had fooled him. Eurydice might have been behind him, but as a shade, having to come back into the light to become a full woman again. Only a few feet away from the exit, Orpheus lost his faith and turns to see Eurydice behind him, but her shade was whisked back among the dead, now trapped with Hades forever.