Orpheus, a lyre playing musician, and Eurydice, a nymph, were a happy couple that just got married. Sadly, Eurydice was bitten by a snake and died while frolicking in a meadow.
After weeks of wandering miserably, the gods were tired of his moaning and told him to go get Eurydice out of The Underworld.
When Orpheus entered The Underworld, he played the lyre to calm the beasts. He played so beautifully that he made it all the way to Hades and Persephone unharmed.
Orpheus talked to Hades, and convinced him to let Eurydice leave, but the only catch was that Eurydice has to walk behind Orpheus, who couldn't turn around and look at her. If he did look at her, she'd be pulled back into the Underworld.
Orpheus and Eurydice were walking out of The Underworld without a problem. But Orpheus got excited. He turned around before Eurydice got out and then Eurydice was sucked back into The Underworld.
Back in the normal world, Orpheus was terribly sad. He sung sad songs for 7 months. Unlike other myths Orpheus stayed loyal to Eurydice and sent away other women. Some of these women were the Maenads, a group of Baucis' followers. The drunk group ripped Orpheus limb from limb and left his head floating down a river. The head wasn't dead, but it was eventually retrieved by group who put him to rest.
The tone of this poem is distressed. Evidence of this is found in multiple places. One is the constant use of exclamation marks. "Hold me but safe again within the bond / Of one immortal look!" (Browning 5-6). Eurydice is scared here, but she knows there is nothing she can do about it. There are also lots of negative connotative words to help the distressed tone. Darkness, woe, and terror are good examples of these words.
The most well known allusion to Eurydice and Orpheus is in Harry Potter and the Sorcerer's Stone. In this allusion, Harry puts Fluffy the three headed dog to sleep with music in the same way that Orpheus did in The Underworld.
Harry Potter and the poem connect to the myth from two different specific instances. The poem describes the last moment that Eurydice and Orpheus had before she was pulled back under. Harry Potter connects to the myth by recreating the section where Orpheus puts the Cerberus to sleep with his music.