Who Invented The Devil Horns?

AXS TV’s investigative documentary series “Music’s Greatest Mysteries” is taking on the origin of the “devil horns.”   A trailer for the episode was released this week and the full show premieres on Wednesday July 14th.  Producers say the show “blends together a passion for music with an investigative curiosity about our music legends, resulting in a unique perspective on some amazing stories.” They went on to say, “We can’t wait for viewers to experience these six new episodes and finally get answers to some of music’s greatest mysteries.”  What do you think is music’s greatest mystery?