I'm surprised no one has mentioned the queen of covers.
After leaving Ike and before her great comeback with the Private Dancer LP, Tina did not have the luxuary of being handed great original songs but she liked to cover songs she loved, which she did not give up even afterwards.
Here is a New Year special - all songs are great covers except the last one Nutbush, which she had penned herself.
Johnny Cash singing "The Mercy Seat" on American Recordings III. I love Nick Cave's original, but Johnny brings his "voice of God" presence to this spinning demon of a song. Pretty intense!