Forty years before this version was recorded, Led Zepplin was the epitome of hard rock bands. Drugs, women, private jets, utterly destroyed hotel rooms: they made the mold of 1970s rock star. With the death of drummer John Bonham in 1980, becoming so inebriated he choked to death on his own vomit in the middle of the night, the band collapsed.
And around thirty years after that, Plant teamed up with Alison Krauss, the greatest voice in bluegrass today (or any other genre), and among other things, resurrected some Zepplin classics, completely re-imagining them. Both the songs and the man, transformed.