In Greek mythology, Orpheus was a famed Thracian bard whose lyre music charmed even the wildest of animals (seen here) and even plants, trees, and rocks. The son of the Muse Calliope, he married the nymph Eurydice after taking part in the Argonaut expedition. According to Greek mythology, after a snake killed her, Orpheus went to Hades (the Underworld) to fetch her. Charmed by his music, the gods freed her, but on the condition that he not look at her until he reached the upper world. As he neared the upper world, he looked back and, as a result, she vanished from his grasp back to the Underworld.