The golden god takes no rest in his sunset years. Well, maybe some, but not as much as he could be. Robert Plant could be content to just reel in money from the hits, but he isn’t. He’s still a formidable force, as you can see. This song sounds quite timeless; it’s not an old folk song, but it could well be. It’s clearly derived from folk music, so you can’t really say that it’s not. How derived depends, I suppose, on how much credit you want to give Plant for his lifelong habit of ‘deriving’ things from other people. Not that it matters – tradition is meant to be bent and mutated by the individual, that’s what allows it to survive.