I listen to a lot of covers, so...
"Cum on Feel the Noize"-original by Slade, cover by Quiet Riot
"Chop Suey"-original by System of a Down, cover by Richard Cheese
"Hurt"-original by Nine Inch Nails, cover by Johnny Cash
"The Mercy Seat"-original by Nick Cave and the Bad Seeds, cover by Johnny Cash
"Ballroom Blitz"-original by Sweet, cover by Krokus
"Radar Love"-original by Golden Earring, cover by Krokus
"Misirlou"-original a 1920 Greek song, cover by Dick Dale
"Live and Let Die"-original by Paul McCartney & The Wings, cover by Guns N' Roses
And finally, in my opinion the most impressive cover...