Following the frankly bizarre news that Metallica and Lou Reed are set to pair up soon, we're looking at the strangest meetings of minds in music over the years. Reed insists the music he's done with the metal legends is the best ever, but that remains to be seen.
The spot at the rock bottom of the pile has to go to Ozzy Osbourne and Miss Piggy, who duetted on a criminal version of Steppenwolf's 'Born To Be Wild' for the 1994 album 'Kermit Unpigged'. Hear the abomination here.
Proving two wrongs make another very wrong thing, Craig David and Sting joined forces for bad on a terrible track called 'Rise And Fall' which masochists can experience on YouTube now.
MOR country star Gywneth Paltrow joined Huey Lewis for the 2000 album 'Duets' for a bin-worthy horrorshow called 'Cruisin''. For a bruising in our humble opinion.
If you thought the concept of an animated gnome movie based on a Shakespeare play wasn't bad enough, the soundtrack featured a tear-your-ears-out-and-throw-in-the-fire collaboration between Nelly Furtado and Elton John of all people.
Of course Elton John is a bit of a serial collaborator, and hooked up with the not-at-all-homophobic rapper Eminem at the Grammys to prove the latter isn't at all homophobic.
Rock dinosaurs festering malignantly past their sell by date in a match made in hell with Britain's worst boy band? That'll be Five + Queen then.
In another contrived Brits hook-up, flame-haired songstress Florence wailed her way through 'You Got The Dirty Love' while Dizzee sort of shouted bits in the background. As rock-rap partnerships go, Aerosmith and Run DMC this wasn't.
Holy shit this one was bad. Canadian crooner Celine Dion lined up her windpipes at soul's cheesiest mofo R Kelly. The result? Go find out if you dare.
Cee-Lo can' t do shit by halves can he? Trussed up like a robotic turkey he pulled both Gwyneth Paltrow (again) and the cast of The Muppets onstage at the Grammys.
90s smooth hip hoppers Bone Thugs N Harmony shared a studio - and a crushingly cheesy video - with Mr Phil Collins for the track 'Home'. File this one under Guilty Pleasure.
The crown prince of indie darkness and the girl that sung 'The Loco-Motion', together? On paper it sounded awful. In reality, Nick Cave and Kylie Minogue's 'Where The Wild Roses Grow' did them both a few favours.
So Def Leppard are looking for a guest vocalist for their monster hit 'Pour Some Sugar On Me'. Who's the best person to call? The timid country singer that sung 'Today Was A Fairytale', of course.
Wu Tang Clan teamed up with George Harrison's son Dhani Harrison for an especially odd rendition of The Beatles' 'While My Guitar Gently Weeps. Erykah Badu and Red Hot Chili Peppers' John Frusciante were also involved.
Pavaroitti and Skin - need we say any more beyond just "NO"?. The pair covered Skunk Anansie's 'You'll Follow Me Down'.
Nelly and Tim McGraw worked together in 2004 in an attempt to blend hip hop and country. Turns out the two genres really are mutually exclusive.
Eddie Murphy was no stranger to Michael Jackson videos. Like the rest of the celeb world he appeared in one ('Remember The Time'), but this bizarre effort, 'What's Up With You', was just wrong.
Way before Tricky was hooking up with Beyoncé, he teamed up with The Specials' Terry Hall for a rendition of 'Ghost Town'. It kind of worked. Better than his Glasto showing, anyway.
Happy Mondays joined forces with the UK's premier yodeller Karl Dencer for 'Lazyitis'. Turns out it was just what the song needed. Erm, not really. Listen here.
What could be worse than the double whammy of Celine Dion and Anastacia? The pair performing AC/DC's 'You Shook Me All Night Long' of course.
If someone had told us Radiohead's frontman would be sharing a stage with LA goofballs Red Hot Chili Peppers' cocksock-sporting slap bassist we'd have laughed them out the room. But there they are, Thom Yorke and Flea, side by side gurning in tandem.
Harden your stomach muscles and prepare the sick bag, it's Dolly Parton and Sly Stallone singing in harmony. Turns out his singing's as bad as his acting - do a double take here.
Kate Moss' marital hook-up with The Kills' Jamie Hince is odd, and her duets with Pete left a little to be desired, but it was the showing on a Primal Scream track ('Some Velvet Morning') that surprised us the most.
We're not adverse to a mash-up but KLF ad Tammy Wynette for the frankly embarrassing 'Justified And Ancient'? Ancient yes, justified never.