Best rock cover songs, list your favorites

Guys/gals im a lover of cover songs, Which songs you enjoy the most? rock or acoustic.
One more where the cover is probably more recognized than the original:

Peter Green/Fleetwood Mac's "Black Magic Woman" being covered by Santana.
Many of the Eva Cassidy's covers of well known songs are, IMO, better than the originals.
OTOH Patricia Barber's version of Black Magic Woman is my favorite. Lila Downs does a great version of this song too.