Today's image depicts the contest between Apollo, the god of music, and the satyr Marsyas, a famous flute player, who challenged the god to a music contest. King Midas, whom you see here on the right, served as judge. When Marysas lost, Apollo flayed Marsyas, taking the satyr's skin as his prize.
You can also find more myths and legends for the week of April 15-21 here. For more information and links to the actual javascript code, see the Myths & Legends Widget Reference Page.