I'm a big fan of Nine Inch Nails, but I still like Cash's version. I think he definitely have the voice, while Reznor sings like he's in the middle of shit, Cash sings like he's looking back on things ...
Johnny Cash does have the ability to make whatever song he covers distinctly and truly his own, like "I Won't Back Down." When I listen to that I feel like I'm hearing a man who has stood up against ...