Orpheus
Ὀρφεύς
The poet whose song moved Hades to tears.
At the sound of his lyre, they say, beasts, trees, even stones would follow.
When his wife Eurydice died, he descended to the underworld and persuaded Hades and Persephone with song.
He was given one condition — "do not look back before you reach the surface" — and at the last moment he looked back, losing his wife forever.
SourcesOvid, Metamorphoses