Jeff Buckley- Hallelujah
Landslide- Smashing Pumpkins
Pearl Jam- Last Kiss
Lenny Kravitz- American Woman
Sheryl Crow- The First Cut is the Deepest
Van Halen- You Really Got Me
The Beatles- Twist and Shout
Carrie Underwood- I'll Stand By You
Sugar Ray- Abracadabra
Limp Bizkit- Behind Blue Eyes
Guns N Roses- Knockin on Heaven's Door
James Ingram- Lips of an Angel
John Denver's cover of Mother Nature's Son. (from Rocky Mountain High)
I'll admit, The Beatles' version isn't one of their best tracks, but Denver's voice and the tempo (which is quite a bit quicker than the original) just strips the song of the feeling it had when you hear Paul singing it.
I heard the worst cover ever in my entire life last month. I was at The Family Values Tour 2007 show in Albuquerque when Evanescence took the stage (they opened for Korn, the headliners). Evanescence played a cover of The Doors song "People Are Strange." The cover seemed forced, awkward, and she used a standard piano instead of a electronic organ or something similar to what The Doors would have used.
I have to say that they really butchered the song and no one in the audience was reacting positively. I don't really care for Evanescence but they really butchered that song. Korn's performance of "Another Brick In The Wall (Parts 1, 2, 3)" blew Evanescence out of the water. I don't know which band member of Evanescence decided to perform that song (probably Amy Lee) but they ruined it. I also felt the same way whenever they performed a cover of Korn's "Thoughtless" as it didn't sound right with female vocals.
Mr. Brightside, originally by the Killers, was covered by Fall Out Boy.
I cannot listen to that without cringing.
I have nothing against Fall Out Boy, I like a few of their songs, but they just chose the complete wrong song to cover.
Lots of good choices already mentioned. Here are a few from my library I like...
Led Zeppelin...Train Kept a Rollin'
Led Zeppelin...For What It's Worth
Led Zeppelin...Nobody's Fault But Mine
Pat Travers...Just Got Paid
Stevie Ray Vaghan...Mary Had a Little Lamb
Joe Bonamassa...Steppin Out/Rice Pudding
The Dirty Mac (John Lennon, Keith Richards, Eric Clapton, Mitch Mitchell)...Your Blues
Keb Mo'...Big Yellow Taxi
Eric Clapton...Higher Ground
Buddy Guy and Keith Richards...Good Morning Little Schoolgirl
MIG...Can't Find My Way Home
Tab Benoit...For What It's Worth
Styx...One Way Out
The Honeydrippers...Sea of Love
Stray Cats...16 Candles
Joss Stone...Fell in Love With a Boy
Dream Theater...The Rover/Achillies Last Stand/TSRTSame
Aerosmith...Big Ten Inch (record)
Back Door Slam...Back Door Slam
The Donnas...Drive My Car
Santana...Black Magic Woman
Jeff Beck...'Cause We've Ended As Lovers
Frank Zappa...Whipping Post
Sophie Milman...Bye Bye Love
Diana Krall...Frim Fram Sauce
Diana Krall...Just the Way You Are
Allman Bros....Come on in My Kitchen
Metallica...Stone Cold Crazy
Robert Plant...If I Were a Carpenter
Ronnie James Dio...Dream On
Godsmack...Good Times Bad Times
Kid Rock...Feel Like Makin Love
Robben Ford...For the Love of Money
Norah Jones...Cold Cold Heart
I dunno the worst cover..but here are my favorite covers:
Don Omar ft. Cynthia - La Isla Bonita
Madonna - American Pie
Lady GaGa - Viva La Vida
Cynthia - Cynderella (Umbrella Cover)
Tyshae Tyshae - Paper Planes
Rihanna - Paper Planes
Artists For Haiti - We Are The World 25th
MTV All-Stars - What's Goin' On