Yes. I call this: "reverse plagiarism." Some must be figuring they'll get more of a listen if it's perceived as a time-worn cultural landmark. The same thing is happening now with the supposed poetry of Rumi and "Hafiz," much of which would be unrecognizable to classic poets like Jalaluddin Rumi and Khawje Hafez. But can you blame them really? Poetry and folk music are pursuits not generally reliable for paying the bills.