See if you can locate YouTube (or other) links to musical monstrosities at least as terrible as these:
Florence Jenkins massacres Mozart
Stayin’ Alive - Jo Stafford (As Darlene Edwards with Johnathan Edwards)
One could search out the entire “Golden Throats” anthology for this.
If, by “musical abominations”, you mean “musical awesomeness”, then there’s always this.
Righteous!
This what you mean? Golden Throats - Wikipedia
Yep, exactly!
I’m going with musical awesomeness on this one. Or at least video awesomeness:
I don’t know how to describe it but I can’t not watch it.
Edit: the real band is in the audience. They are the third group of fans to get blasted in the end.
In a thread like this, I believe you’re obligated to include this video.
(You get bonus points if you can make it to the end.)
I’ve always been fond of The Shaggs. Check out My Pal Foot Foot.
Over five minutes of screech: william hung- I believe I can fly
If we’re bringing in Zappa’s appreciations, we can’t leave out Wildman Larry Fischer
You, sir, win.
That drummer makes Meg White sound like Bill Bruford.
I was going to mention The Shaggs but someone has already done it so i give you Secret Agent Man by David Hasselhoff
Well, there’s always the Russian guy.
I’m almost certain Mrs. Miller sits behind me in church on some Sundays.
Submitted for your approval:
You’ve lost that loving feeling…and a lot else
It’s really easy to make it to the end when you can just drag that little fake plate. I heard the guy “sing” maybe once. 
My nomination - Barbie Girl by Aqua.