Lorde  is the latest musical celebrity to make an “appearance” on South Park and both Billboard and the singer herself happen to think Trey Parker and Matt Stone nailed it. Mocking the Lorde birth certificate truthers with Stan’s dad moonlighting as a middle-aged, male version of the songstress? Perfect. To celebrate over a decade and a half of genius (and, well crudely-genius) intersections with our world, Billboard picked out the show's most memorable music moments, from gay fish denier Kanye West  to Jennifer Lopez  as a hand-puppet to Justin Bieber  as "the enemy." Relive the musical mayhem below.
The Cissy (2014)
In the third episode of Season 18, a subplot focuses on Stan Marsh's dad, Randy, who pretends to be Lorde in order to gain access to the women's bathroom at work (the week before week, he played the part at a party, looking to impress the kids). A fictional Spin reporter then arrives in South Park, looking to expose the very obvious truth -- that "Lorde" is really a 45-year old geologist with Auto-tune and a host of other laptop tricks on his side.
Radiohead Hates Scott Tenorman (2001)
Season 5 highlight "Scott Tenorman Must Die" may be best remembered for its hilariously disturbing final scene, but the episode also featured a rare TV cameo by Radiohead  themselves, who stop by Colorado after receiving some fan mail from Cartman. Even those who don't appreciate alternative rock must have enjoyed Thom Yorke  exclaiming, "This poor kid has cancer! In his ass!"
The Cure for Barbra Streisand (1998)
South Park has skewered its fair share of musical artists, but it's hard to imagine anyone getting it worse than Barbra Streisand , who literally tortures the boys with her singing voice before morphing into a robotic "Mecha-Streisand" that destroys South Park. Meanwhile, the same episode portraying Cure  frontman Robert Smith  (he provided his own voice for the episode) as a superhero, capable of defeating evil without losing his dejected coolness. Before he walks off into the sunset, Kyle yells, "Disintegration is the best album ever!"
Chef Aid (1998)
In this classic episode, Chef is outraged to find a new hit song from Alanis Morissette  is a copy of one he wrote years ago. With Johnnie Cochran opposing him, a lawsuit backfires and he finds himself needing $2 million to avoid four years of incarceration. The boys around up a benefit fest featuring Ozzy Osbourne , Rancid , Joe Strummer , Primus , Ween , Elton John , Meat Loaf , Rick  James , DMX , and Devo  to help their friend. Even though the proceeds fall short, Cochran is so moved that he switches sides and Chef finally gets credit for the song.
Timmy 2000 (2000)
Timmy and his ubiquitous catchphrase come to town and soon all the South Park children are prescribed Ritalin just like the new student. Numbed by the medication, everyone is lulled into liking a visiting Phil Collins , who breaks up Timmy’s band and headlines South Park’s Lalapalalapaza himself. But once the Ritalin is out of everyone’s systems, the tables turn on Collins, and Parker and Stone get their metaphoric revenge on the Tarzan soundtrack singer for beating them to a 1999 Academy Award.
Kanye West Loves "Fish Sticks" (2009)
In "Fishsticks," Kanye West is the only person in the country who fails to see the humor in the funniest joke of all time. Parodying the rapper's healthy ego, he refuses to admit that he doesn't get the joke because he is a "genius."
Michael Jackson ... We Mean 'Jefferson' (2004)
In Season 8, a new neighbor -- "Mr. Jefferson" -- started wreaking havoc on the South Park boys by acting like Peter Pan and not taking care of his son, Blanket. The subtle shots at Michael Jackson's  persona also included scenes of him sleeping in the same bed as prepubescent boys -- not a good look for the King of Pop.
Justin Bieber Killed by 'The Coon' (2010)
In the last installment of a four-episode arc, the Coon and Friends 'superheroes' take on their "most challenging and most evil opponent" -- Justin Bieber -- to save America: the result is deadly.
Britney Loses Her Head (2008)
The South Park gang loves to kick celebs when they're down, but the boys actually stood up for Britney Spears  when she was going through her meltdown. Well, sort of. After the stressed-out Brit blows off her own head in the episode "Britney's New Look," she is still forced to perform at the VMA Awards, much to the dismay of Kyle and Stan. (How'd they get those seats, anyway?)
J. Lo Gets Dropped (2003)
In this 2003 episode, Cartman wins first place in a Latino culture contest by showcasing his special guest, Jennifer Lopez, who turns out to be a crude hand puppet. The Puerto Rican singer is portrayed as a sassy Mexican who loves tacos, burritos, and Ben Affleck.
Metallica Fights the Power (2003)
When the boys' band Moop goes on strike, Metallica  (who were at the time protesting the rise of Napster and free downloading services) joins them in their struggle for money. "Why play if you're not going to make millions of dollars?!" Lars Ulrich asks while holding a sign that reads "I Strike Because I Can."
Biggie Back From the Dead (2006)
Saying the name "Biggie Smalls" three times in the mirror won't actually awaken the soul of the legendary New York rapper… will it? We've been too afraid to try after watching this Season 10 episode, in which the Notorious B.I.G.  fires shots at the South Park boys when he's not trying to get to Satan's "Super Sweet 16" party.
Korn Gets Groovy (1999)
"Korn's  Groovy Pirate Ghost Mystery" turns the nu-metal stars into the "Scooby Doo" gang, as they invade South Park to chase down pirate ghosts and learn life lessons. Bassist Fieldy is hilariously turned into the Velma of the group, with the obligatory scene in which he can't find his glasses while pirate ghosts (or is it ghost pirates?) are approaching.
Diddy Says 'Vote or Die' (2004)
Luckily, Diddy's  2004 "Vote or Die" campaign wasn't literal, or else it would have looked something like this Season 8 episode. The rapper goes door-to-door threatening people who don't understand the importance of voting, brandishing a handgun in their faces and rapping, "Get out there and vote, or I will motherf--king kill you."
Bono's Big Load (2007)
What's more insulting: the depiction of Bono as an opportunist who dances around impoverished countries singing "Vertigo" to himself? Or the depiction of Bono as a giant piece of crap -- literally? Either way, the "South Park" creators clearly aren't fans of the U2  singer and humanitarian, and give him a skewering reminiscent of the "Mecha-Streisand" episode.
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