According to the UK's Daily Mail, Celine Dion's cover version of AC/DC's "You Shook Me All Night Long" is the worst cover song.

Here is her performing the song at "Divas Las Vegas" in 2002.



The experts rated the top five worst cover songs of all time.

01. Celine Dion - You Shook Me All Night Long (AC/DC)
02. Girls Aloud/Sugarbabies - Walk This Way (Run DMC and Aerosmith)
03. Westlife - More Than Words (Extreme)
04. Will Young - Light My Fire (The Doors)
05. The Mike Flowers Pops - Wonderwall (Oasis)

Here is the Walk This Way cover for comparasion.



It is hard to pick really bad covers of awesome songs. That list is terrible, but I feel they are neglecting a few cover versions:

Snoop Dogg - Sad But True (Metallica)                            Avril Lavigne - Chop Suey (System of a Down)


                                 

Hilary Duff - My Generation (The Who)                               Limp Bizkit - Behind Blue Eyes