After my wife died, I was so upset that I traveled to the underworld and with my music softened the heart of the Queen of the underworld. She felt so sorry for me that she allowed my wife to return to earth with me. There was one condition: I had to walk ahead of her and not look back until we reached the upper world. In my anxiety I broke my promise, and my wife vanished from my sight. I was never to see her again. Who are we