The ancient legend of Orpheus and Eurydice concerns the fateful love of Orpheus of Thrace, son of Apollo and the muse Calliope, for the beautiful Eurydice (from Eurudike, "she whose justice extends widely").

It may be a late addition to the Orpheus myths, as the latter cult-title suggests those attached to Persephone. It may have been derived from a legend in which Orpheus travels to Tartarus and charms the goddess Hecate

Source: Wikipedia

Apollo gives his son Orpheus a lyre and teaches him how to play.

Orpheus played with such perfection that even Apollo was surprised. It is said that nothing could resist his beautiful melodies, neither enemies nor beasts. Even trees and rocks were entranced with his music.

Orpheus fell in love with Eurydice, a woman of unique beauty and grace, whom he married and lived happily with for a short time. However, when Hymen was called to bless the marriage, he predicted that their perfection was not meant to last.

A short time after this ominous prophecy, Eurydice was 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 was merely dancing with the Nymphs. In any case, while fleeing or dancing, she was bitten by a snake and died instantly.

Orpheus sang his grief with his lyre and managed to move everything living or not in the world; both humans and gods were deeply touched by his sorrow and grief.

At some point, Orpheus decided to descend to Hades to see his wife. Any other mortal would have died, but Orpheus, protected by the gods, went to Hades and arrived at the infamous Stygian realm, passing by ghosts and souls of people unknown. He also managed to charm Cerberus, the monster known to have three heads. Orpheus presented himself in front of the god of the Underworld Hades (Pluto) and his wife Persephone.