Orpheus, a lyre playing hero, had eyes for no one but the nymph, Eurydice. His love for her was his inspiration for many of his songs, and he felt connected to her. They decided to wed.
All nature celebrated on their wedding day, but that very morning, as Eurydice went down to the riverside with her maidens to get flowers for a bridal garland, a snake, bit her in the foot, and tragically, she died. Orpheus was very upset and his songs he played weren't as joyous anymore.
Orpheus took his lyre and made his way to the yawning cave which leads to Erebus, where poor Eurydice had went. He was so extremely sad, he needed her back.
"The spirit of Eurydice shall follow you to the world of the light, but if you look back at her, she will return to me.
Orpheus strode out of the hall of Hades, and the ghosts made way for him to pass.
Orpheus was getting worried that his love wasn't truly behind him, so he turned. He saw a dim outlining of Eurydice. A little whisper came from her mouth, "Goodbye my love" as she scattered into mist, returning to Hades.
The women of Thrace were infuriated by Orpheus's contempt, and killed him. As his body was swept down the river, his lips whispered, "Eurydice," one last time. Eurydice and him now walk along daffodil fields together and Orpheus goes ahead and looks back at his love.