Best rock cover songs, list your favorites

What about the Beatles' cover of "La Bamba" (renamed "Twist and Shout")?

Aretha's version of Bridge over troubled water.
Or anything else she does,

A coupla oddball additions worth hearing:

Richard Thompson (monster guitarist) covering Britney Spears' "Oops, I did it Again".

Marshall Crenshaw (indie singer/songwriter) covering ABBA's "Knowing Me, Knowing You".

On a different note, I just picked up Todd Rundgren's Johnson - a CD of Robert Johnson covers. I saw him do this live and thought it worked pretty well. I was surprised to find that I like the CD even more than the live show. Definitely worth checking out if you like hard, crunching, electric blues guitar as channeled thru a player with a tremendous innate melodic gift.

Maybe I'm growing too cantakerous, but I find these Old, Musically Barren Rock Star Makes Covers Album exercises to be really dreary. Rod Stewart, Neil Young, Eric Clapton, even Glen freakin' Frey. Last really good one I hear was PinUps by David Bowie, which dates back to 1973.

Crosby, Stills, Nash, and Young cover of Joni Mitchell's "Woodstock"