Though my days are over,
You know where I'll be,
Swim that lost river to me…

Lost River - Murder by Death

After the death of his beloved wife, Orpheus was no more the same carefree person he used to be. His life without Eurydice seemed endless and could do nothing more than grief for her.  He decided to go to Underworld and try to get his wife back.

Hades told Orpheus that he could take Eurydice with him but under one condition; Eurydice would 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 because he would lose her forever.