You can't really compare the sun and the moon, and you can't really compare Johnny Cash's The Man Comes Around with Cat Power's cover of Remember Me, so I just made the decision, after three hours of repeat listening and reflection, that they are both deservedly pretty much the co-best song ever.
Johnny Cash The Man Comes Around
American Recordings IV: The Man Comes Around
eMusic Session EP
NOTE: I am embedding one of her other beautiful covers, Paths of Victory, as Remember Me is not on Spotify.