Orpheus in the Underworld. Orpheus and Eurydice. Take your pick. Hope this helps.

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The most famous story in which Orpheus figures is that of his wife Eurydice (also known as Agriope). While fleeing from Aristaeus (son of Apollo), Eurydice ran into a nest of snakes which bit her fatally on her legs. Distraught, Orpheus played such sad songs and sang so mournfully that all the nymphs and gods wept. On their advice, Orpheus travelled to the underworld and by his music softened the hearts of Hades and Persephone (he was the only person ever to do so), who agreed to allow Eurydice to return with him to earth on one condition: he should walk in front of her and not look back until he had reached the upper world. In his anxiety he broke his promise, and Eurydice vanished again from his sight.