In Greek mythology the son of Oiagros and the muse Kalliope is a gifted musician, poet and singer. Apollo gave Orpheus a lyre, on which he made such beautiful music that he calmed the wildest animals and even moved the rocks. His young wife Eurydike was killed by a snake bite. Orpheus went to the underworld to retrieve her and was given permission to do so by Hades, the ruler of the dead, moved as he was by Orpheus' lyre play. But Hades made this condition that he should not look back to see if Euridike was following him. At the last moment, Orpheus could not contain his desire to see her. He looked back and she disappeared into the underworld forever. The drama was described by Ovid and Virgil, in poems by Valérie and Rilke, in a play by Anouilh and in operas by Monteverdi and Gluck. Gluck's still ends with a happy ending.