More from EW
1 of 15
The voices were lovely, but what was this Michael Jackson song doing on the show? Let's not forget: The song is about a rat.
2 of 15
14. ''Empire State of Mind''
The buzz leading up to the season 2 opener was huge, but unfortunately the big kick-off number may have been one of the first performances wherein Glee lost any grasp it had on keeping the music in the realm of reality. Rap solos by Artie and Finn didn't exactly help, either.
3 of 15
13. ''We Got the Beat''
Oof. You knew something was up when Rachel began her pre-song pep talk with, ''The more people that we sing in front of?''. If the New Directions flash-mobbed my lunchtime with a Go-Go's song, I would have actually just thrown my lunch in the trash and left. Appropriately, as soon as the song ended, a food fight began, and everything was right again with the world.
4 of 15
12. ''Jolene''/''One Bourbon, One Scotch, One Beer''
There is absolutely nothing wrong with the luminous Dot-Marie Jones, but the few times she's gotten to take center stage and sing have been some of Glee's most random. Let's never forget Coach Beiste's drunken country-fried performance at Rosalita's Roadhouse. Actually, just kidding, let's forget.
5 of 15
11. ''Americano''/''Dance Again''
Note: Just because Lady Gaga sang it doesn't mean you need to cover it. Kate Hudson was a fun addition to the show's sometimes sluggish fourth season, but this number — full of over-the-top dancing and a weird spin on Gaga's already weird ''Americano'' track — wasn't a high point.
6 of 15
Boy, did the prom songs get it wrong. Ke$ha's ode to the prehistoric is a perfectly fine song for, like, a college pregame or a jaunty treadmill jog, but it is decidedly not best performed at a school function. Similarly, Glee's inevitable take on Rebecca Black's abysmal weekday anthem was doomed from the painful, painful start.
7 of 15
9. ''Sexy and I Know It''
Don't get us wrong: We love a cheesy choir room number. But Ricky Martin's take on the LMFAO hit left a lot to be desired (except maybe in the wiggle-wiggle-wiggle-wiggle-ing department). The performance combined all of the worst parts of Glee: Excessive Auto-tune, ridiculous dance numbers, a cover that really didn't give the tune an original take. Also, not that it's ever stopped the show before, but the whole thing was super-inappropriate.
8 of 15
8. Anything by Tina Cohen-Chang
It's not (totally) Tina's fault she's a complete punching bag on the show?but her solos aren't doing her any favors. The ship for her to get a decent song sailed right around the time Kurt and Blaine got together, and it's been a downhill march for the past couple seasons.
9 of 15
7. ''Hair''/''Crazy in Love''
The season one episode ''Hairography'' was when we first got a taste of how kooky the show could be (the mattress store number notwithstanding). Up until then, the mash-ups had been novel, but this cross between Beyoncé and Broadway just didn't gel. Its place on the list is corroborated by its inclusion on Sue Sylvester's season 2 list of ''Worst Songs Sung by the Glee Club.''
10 of 15
6. ''The Fox (What Does the Fox Say?)''
So often when it comes to Glee's worst moments, the question of WHY springs to mind. Why did the show need to cover the viral hit? Why, once they decided to give it their own spin, did they have the cast dress up with animal masks? And finally, why the puppets? The image of Kitty with an animal mask on is burned into our collective minds. This is why people are so often mad at you, Glee.
11 of 15
5. ''Blurred Lines''
Just because a song is popular doesn't mean you perform it at school?particularly with a teacher. To paraphrase Amy Poehler's Mean Girls character, Will isn't a regular teacher; he's a cool teacher. So cool, in fact, he sees no problem with sexily strutting down the halls with students while crooning Robin Thicke's questionable-at-best lyrics.
12 of 15
4. ''I Still Believe''/''Superbass''
Poor Blaine. His ''I Still Believe'' was just collateral damage. The first part of this number is fine, but as soon as Jane Lynch starts rapping — seriously, who was asking to see that? —fans knew this number would go down in infamy. Moment of silence for Jane Lynch, whose talent should allow her to opt out of lines like, ''That's the kind of dude I was looking for/and yes you'll get slapped if you're looking ho.''
13 of 15
3. ''Christmas Don't Be Late''
Performing Christmas songs every year for five seasons means there were going to be some duds in there eventually. And they hit rock bottom in season 5 with ''Christmas Don't Be Late'' high-on-helium balloons in the style of Alvin & the Chipmunks. No one would have minded if there was just one less song in the Christmas show this year.
14 of 15
2. Whenever Will raps
I'm not sure when Matthew Morrison decided to add ''rap'' to the list of skills on his LinkedIn, but the former Broadway hoofer has been exercising his...love of rhythmic speech since Glee's second episode. We first got a taste of the awful with ''Gold Digger'' and thought, ''Hey, maybe this is just an isolated incident?'' But no no, my friends, because Will followed that up with ''Bust a Move,'' ''Thong Song,'' and ''Ice Ice Baby,'' all of which were cringe-inducing attempts at rapping in corduroys.
15 of 15
1. ''Gangnam Style''
No. Just?no. Many viewers cringed when they heard Glee would be covering Psy's K-Pop viral hit — and at a competition, no less! Turns out, there was good reason to be concerned. The group number, unfortunately led by Tina (you know, 'cause she's Asian!), was a total mess that had us longing for the days when ''Friday'' was the most ill-advised performance the show had ever attempted.