there's a southern English poem – Sir Orfeo – on the same theme, which dates back at least to the early 14th century, and most scholars believe it to be a translation of a lost French/Breton original. Textually it shares little with Child 19, though the narrative has more in common with the ballad than with the Greek myth; but it is in the same couplet form as Child 19 and could easily be sung to the ballad tune (though it would take at least an hour to sing it...)