What is your favorite cover?

Deep Purple covers of Help, Kentucky Woman and Hush.

Yes cover of Every little thing.

Jimi Hendrix cover of all along the watchtower

I kinda like Guns and Roses covers, such as "Live and Let Die" and "knockin on Heaven's Door."

There are some people whose voice I like a lot, but, when they cover favorite songs, it almost hurts to hear the travesty.  The ultimate one woman wrecking crew for me is Linda Ronstadt:

"Alison" (Elvis Costello)

"Carmelita" and "Hasten Down the Wind" (and a whole bunch of other Zevon songs)

"Blue Bayou" (Orbison)

I have a real soft spot for Incognito's cover (with Mario Bondi) of Boz Scaggs' Lowdown...

https://www.youtube.com/watch?v=dHnsBZ_kL0I

Plenty of great covers of Leonard Cohen songs.  Among my favorite:

Concrete Blonde: "Everybody Knows"

Jeff Buckley: "Hallelujah"

R.E.M.: "First We Take Manhattan"

How about a banjo version of Slayer's "Raining Blood":