A song murdered by someone.

Is there a cover version of a song you like by the original artist that has been in your ears truly murdered by a covering artist?
Mine is 'Everybody Knows' by Leonard Cohen, absolutely murdered by Barb Jungr.

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Yoko Ono's cover of Someone Like You by Adele.   Check it out on youtube and see if its the most frightening sound you have ever heard
How about a whole album.

My vote goes to Peter Frampton and The Bee Gees re-imagining of Sgt. Pepper’s in 1978 for the musical film of the same name. The album was so bad it’s impossible to pick a worst of..  The movie intro says it all.

“This musical, set to late-period Beatles hits, recounts the story of Sgt. Pepper's famed musical group, which found success during World War I bringing music to weary soldiers in the field. The band's leader has since died and now it's up to his grandson, Billy Shears (Peter Frampton), to carry on the group's traditions. To this end, he recruits the Henderson brothers (Barry Gibb, Robin Gibb, Maurice Gibb) to help him defend the group's magic instruments from nefarious crook B.D. Hoffler.“