During my four days without land line, cable tv or internet (thanks Uverse!!) I thought of many things.  All dumb.
 
One of those things was to post this thread seeking to ascertain what your absolute favorite "cover tune" is and who did it.
 
For instance...while it would be all too easy to say that mine was Donald Fagen's version of "Ruby Baby"...it's not.
(favorite piano solo in a pop tune, yes...but cover, no).
 
That honor for moi goes to:  Marc Cohn's (and his producer John Leventhal's) cover of Harry Nillson's "Turn On Your Radio".
 
http://www.youtube.com/watch?v=6lxwsbq1hyE&list=RD6lxwsbq1hyE
 
What's yours??
 

Glad you didn't loose your electricity. I think loosing my phone for awhile would be a good thing.Internet not so much.
 
 
I'm presently a trove of emptiness concerning your question.
 
This is terrible to say but I don't want to hear anyone else playing anything or even think about it. My ears are on overload from last night. I have been without cover tunes for longer than 4 days and I hardly remember them any more. I get down right tired of the commercials on the radio in my car and my better half gets tired of my turning on the radio at home. I even got one of those new blue tooth streaming things I hook up to my phone. Thousands of stations but we seldom ever agree on which one is best. Pretty soon I won't even know what a cover tune is anymore. 

 
 
Yeah, love Cohn's cover of that tune. great album actually.
 
This is an easy one. I was stunned by this when I first saw it, and still watch it regularly, Jacob Moon's version of Rush's 'Subdivisions'
 

Here's a couple of my favorites:
 
Bangles - Hazy Shade Of Winter
 
Judas Priest - Green Manalishi
 
 

Here's a few off-hand. Not sure if I have a favorite though (sorry):
 
Jerry Douglas with Mumford and Sons doing Simon & Garfunkel's "The Boxer". I love Douglas' Dobro work:
http://www.youtube.com/watch?v=sQpUs1qNxMM
 
K.D. Lang makes Leonard Cohen's "Hallelujah" her own. What a singing voice!
http://www.youtube.com/watch?v=MT-hAfIODXQ
 
And she does it again with Neil Young's "Helpless":
http://www.youtube.com/watch?v=gT2z9TO0bfQ
 

KenB123
 
Jerry Douglas with Mumford and Sons doing Simon & Garfunkel's "The Boxer". I love Douglas' Dobro work:
http://www.youtube.com/watch?v=sQpUs1qNxMM

 
That's wonderful. Douglas is a genius.

craigb
Here's a couple of my favorites:
 
Bangles - Hazy Shade Of Winter
 
Judas Priest - Green Manalishi
 
 

OOOOOoooo...I'd totally forgotten Hazy Shade of Winter...also linked to some fine punk and metal covers...might have to do one my own self.  Thanks!!
 

 
I Don't Need No Doctor--Humble Pie.  Written by Ashford & Simpson.  Ray Charles did an early version of the song.  Many others have also covered it. 
http://www.youtube.com/watch?v=LZMmV6xXYFw
 
Hush--Deep Purple.  Original by Joe South. 
http://www.youtube.com/watch?v=R-x7RqRF8Pk
 
 

 
Quite simply, the best cover version of any song....................ever!!
 

 
 
Just going for a stroll in the trees
 
 

 
Quite possibly, the second best cover version of any song etc.....
 

 
 
"A single shot rings out in a Belfast night...."