Covering other people's material is a mainstay in pop music. Why bother taking the time to write an original song when you can just recycle somebody else's hit, redo it with an acoustic guitar (or, if it's an acoustic song, with an electric guitar) and generate the same result? But it doesn't always work out as planned, especially if you don't bother to figure out what made the original song popular in the first place (or in the case of our #1 choice, even bother to learn the damn lyrics first). Below, 20 great songs that received sound butcherings by artists who should've known better. A lot better.
#20. "You Shook Me All Night Long" - Celine Dion and Anastasia
#19. "Downtown Train" - Rod Stewart
#18. "Knockin' on Heaven's Door" - Guns N Roses
#17. "Demolition Man" - Manfred Mann
"I'm a walking nightmare, an arsenal of doom / I kill conversation as I walk into the room." This sums up Manfred Mann's music quite nicely, actually. They struck gold with their cover of Springsteen's "Blinded by the Light," but one hit does not excuse the litany of brutal covers with which they've ear-raped us with before and since, from The Jam's "Going Underground" to Dylan's "It's All Over Now (Baby Blue)". But the absolute nadir is probably this, their slaughter of The Police's "Demolition Man," which somehow manages to beat out Sylvester Stallone for the title of worst Demolition Man ever.