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Midas, now hating wealth and splendor, moved to the country and became a worshipper of Pan, the god of the fields and satyr. Once, Pan had the audacity to compare his music with that of Apollo, and challenged Apollo, the god of the lyre, to a trial of skill. Tmolus, the mountain-god, was chosen as umpire. Pan blew on his pipes and, with his rustic melody, gave great satisfaction to himself and his faithful follower, Midas, who happened to be present. Then, Apollo struck the strings of his lyre. Tmolus at once awarded the victory to Apollo, and all but one agreed with the judgment. Midas dissented, and questioned the justice of the award. Apollo would not suffer such a depraved pair of ears any longer, and caused Midas' ears to become the ears of a donkey.
Also see Ernst Bloch "Magic Rattle and Human Harp"