Villain Song/Western Animation

"The Chameleon: I'm so happy, happy, Snappy, Trappy---"
 * The Simpsons: Mr. Burns singing "See My Vest" in a parody of Beauty and the Beast's "Be Our Guest".
 * Also present in the musical episode "The President Wore Pearls", a parody of Evita, with Skinner's "Evil Plan" song (sung in tandem with a hilariously drunken Groundskeeper Willie).
 * A case could also be made for The Stonecutters' "We Do". It certainly fulfills the "best song" part of the equation.
 * In addition to "See My Vest", Burns also got a song on the The Simpsons Sing the Blues album, called "Look at All Those Idiots" (the idiots, of course being Burns' employees at the power plant).
 * Beware of SCORPIO!/He'll sting you with his dreams of power and wealth/Beware of SCORPIO!/His twisted twin obsessions are his plot to rule the world and his employees' health!"
 * In the episode "Marge Gets a Job," we get Smithers' tribute song to Mr. Burns, a parody of a similar song from Citizen Kane.
 * The SpongeBob SquarePants episode "F.U.N.", in which Plankton sings a demented and deliciously villainous reimagining of Spongebob's friendship song "F.U.N." - "F is for fire that burns down the whole town, U is for uranium - bombs!, N is for no survivors WHEN YOU--..."
 * "Plankton! Those things aren't what fun is about!"
 * Plankton gets a full-blown Villain Song in "Atlantis Squarepantis", simply called "Plankton's Song".
 * He get's another one on the Best Day Ever CD called "You Will Obey".
 * Squidward also does a parody of Villain Songs on the same CD with "Superior".
 * Dr. Robotnik in The Adventures of Sonic the Hedgehog episode "Sonic's Song". Notably, in his first attempt to write one, the singer he is holding captive twists it into a "The Villain Sucks" Song.
 * Later on in the episode "Lifestyles of the Sick and Twisted", we get the fantastic little number Sonic is in my dungeon!
 * Mumbo's "Master of your Fate" from the Teen Titans episode "Bunny Raven".
 * Notable in that he is the ONLY villain in the entire show to get one.
 * Grandma Stuffum's rock opera, "Slamwich", in the Codename: Kids Next Door episode F.O.O.D.F.I.T.E. GWAR did the music for the episode, and the number is a combined variation of their songs "The Private Pain of Techno Destructo" and "Gor-Gor".
 * Also, Stickybeard's "Licorice, Licorice" from L.I.C.O.R.I.C.E.
 * The Spinach Inquisition.
 * "The Pixie Rap" from Fairly Oddparents: School's Out! The musical. They get several reprises throughout the movie.
 * Norm the Genie would later get "Gimme the Wand" in Fairy Idol.
 * The villainous singer ghost Ember from Danny Phantom has "Remember".
 * "The Spooks' Song" from Halloween is Grinch Night. Although the monsters during the whole sequence are pretty tame, the music is very intense.
 * "Bah, Bug 'n Hum" (8:10 onward) sung by the Postman in Olive the Other Reindeer.
 * Futurama: The Robot Devil's upbeat, pyrotechnics-and-dance-filled tour of Robot Hell in "Hell Is Other Robots".
 * All the music in the pre-UnCancellation finale, "The Devil's Hands are Idle Playthings", is effectively one long number. The Robot Devil still gets probably the best lines.
 * In Bender's Big Score, the Scammers are left out of the film's two songs, probably because they're one-off villains not related to any previous storylines. Robot Santa and his cohorts get an impressive number called "This Trinity's Going to War" near the end of the film, but he's on the humans' side this time.
 * The robot devil was going to sing a song in "Ghost in the Machine", but Bender stops him.
 * Phineas and Ferb: Dr. Doofenshmirtz gets a lot of these.
 * My Little Pony examples:
 * "We're Witches" and "Nothing Can Stop the Smooze" (My Little Pony the Movie)
 * "You Ain't Seen Nothin' Yet" (The Ghost of Paradise Estate)
 * "There's Nothing Quite Like Shadows" (Bright Lights)
 * "I Hate Soft" (Crunch the Rockdog)
 * "Here's to Power" (The Quest of the Princess Ponies)
 * My Little Pony Friendship Is Magic got its first Villain Song in "The Super Speedy Cider Squeezy 6000", courtesy of the Flim-Flam Brothers, who introduce themselves and the titular cider-making machine in song.
 * "A Canterlot Wedding, Part 2" features another, with extra puppy-kicking: the "This Day Aria". It's also a Distant Duet, . It later gets a short reprise, with only the villain singing.
 * The Clone High musical episode has two: The Pusher (voiced by Jack Black) gets the aptly-titled "I Am the Pusher", and Principal Scudworth gets "Build It Higher" after he takes over the PTA.
 * "Brains" from The Grim Adventures of Billy & Mandy. Sung by Voltaire, to add to the fun.
 * Underfist has Mindy's song "Trick or Treater Eaters".
 * Pirates: They don't just sing sea shanties anymore!
 * During an episode of the obscure Spartakus and the Sun Beneath the Sea, the pirates introduce themselves with the "Pirate Song".
 * Yogi Bear's christmas special, "Mean, Sour, Nasty and Cruel."
 * It was later reshaped into Gargamel's Villain Song for The Smurfs episode "The Blue Plague".
 * The Misfits' "Outta My Way" from Jem and The Holograms could be a Villain Song for Pizzazz.
 * It could be said that any song by the Misfits is a villain song. (Another good one is 'Making Mischief'.)
 * Professor Coldheart's song from "The Care Bears in the Land Without Feelings". See for yourself.
 * And his OTHER song from "''The Care Bears Battle the Freeze Machine. There's just something about the guy.
 * Belladonna's song "I Always Get Emotional at Christmas Time" from "All Dogs Go to Heaven: A Christmas Carol".
 * In her first appearance, her song "Take The Easy Way Out" is used to
 * The Backyardigans: the first superhero-themed episode, Race to the Tower of Power, had "We are Supervillains" and "Key to the World". (The performers (Pablo and Tyrone) are villains just for that episode, but it still counts.)
 * In the episode Cops and Robots, there's We Are Bad Bots sung by Pablo (as the Pablonator) and Tasha (as T-800).
 * Lady In Pink from the spy episode.
 * "I am Professor Bug" and "Whatever I Want" from Robot Rampage.
 * Being a musical series, the animated adaptation of Donkey Kong Country had several. Most of the songs are forgettable at best, but those sung by Kaptain Skurvy are actually quite catchy.
 * For example: "Pirates Scorn" and "Booty Boogie" for Skurvy, while K.Rool has (but isn't limited to) "One of Us" and "No One's Going to Make a Monkey Out of Me".
 * From the same episode as "One of Us" comes "The Mirror Never Lies", a preceding song by Kaptain Skurvy where he convinces Donkey Kong that he's a Kremling Pirate. Klaptrap, although he's more of a neutral than anything, gets a song of his own called Someone Get My Teeth Back!.
 * Of particular mention should be "Become a Bad Guy", In which we get some amusing anecdotes of just a FEW of the villainous things King K. Rool does whilst Candy helps Donkey Kong try to figure out how he can play the part of a villain.
 * Freakazoid!'s inexplicable "Hello Dolly" parody, "Bonjour Lobey".
 * "Where did he go!? That Invisibo!?"
 * In an episode of Eek! The Cat, two witch cat sisters who serve as the villains perform two songs: "Anabelle Must Simply Disappear", and "Send in the Lawyers", in a rock opera style.
 * In Moral Orel, the most popular song of the school pageant episode was Judas' "I hate You Jesus" song. Ironically, it's the protagonist Orel who's playing him, though.
 * In a deleted scene from the Family Guy episode "Lois Kills Stewie" Stewie performs his villain song "I've Got A Little List" describing the people that he hates and killing them in creative ways.
 * Very appropriately, Stewie's song is a version of the one from The Mikado, seen above.
 * There is a rock opera episode of The Powerpuff Girls called See Me, Feel Me, Gnomey that never aired in the United States. At the beginning, the regular villains had a song, Townsville's Going Down, and several songs are sung by the episode's main villain. It can be viewed on the complete series DVD box sets.
 * Or you could just go here. Youtube isn't the only source for videos on the internet.
 * There's also this song about Mojo Jojo, sung by Devo.
 * "Virtuoso of Insanity", an Atomic Betty episode, had Maximus IQ singing a song until it was hijacked by Betty.
 * An episode of Tiny Toon Adventures, Tiny Toons Music Television, had Montana Max singing (okay, lip-synching) Money (That's What I Want) by Barret Strong. It definitly fits his personality. The album Tiny Toons Sing! does have him sing the song himself.
 * Grizzle, the villain of Adventures in Care-a-Lot, sings "Grizzle's Bad" in the direct-to-DVD "Oopsy Does It."
 * The Musical Episode of Avenger Penguins, "Rock n Roll Penguins" gave its villain Caractacus P Doom one of these, performed in a lounge style.
 * On ChalkZone, the Big Bad Skrawl sang in three episodes. Every time, it was the same tune with new words. The final time, he sung it along with Craniac 4.
 * The Musical Episode of Batman the Brave And The Bold, "Mayhem of the Music Meister", is full of these. I'm the Music Meister, Deathtrap and The World is Mine! are all examples, and sung by Neil Patrick Harris no less. Drives Us Bats tops it off though, being not only a song about how frustrating dealing with Batman is, but also references the theory that half of the insanity in his villains is caused by Batman himself, and gets nearly every damn villain and even several heroes at least cameoing in it.
 * The Joker gets an Epic one in "Emperor Joker" called Where's the Fun in That?
 * Harley Quinn has her own musical number in the 'Harlequinade' episode of Batman the Animated Series.
 * In Justice League Unlimited, Circe does her own rendition of "Lulu's Back In Town."
 * Eric Cartman's racist song Minorities in my Water Park on South Park's episode "Pee".
 * He gets another one "Cthulhu and Me" from Mysterion Rising.
 * Dexter's Laboratory: The Hip Hop Experiment gives us "Mandark's Plan". It's sung by rapper YZ, but he sings it as if he were Mandark, boasting about how he'll rule the world, lock up Dexter, and have Dee Dee as his wife.
 * Pinky and The Brain has "A Merticulus Analysis of History", a song by the Brain about the exploits of other would be world conquerors, and how he wouldn't make the same mistakes.
 * He gets another, titled "The Really Great Dictator", where he sings to Pinky about his plans for world domination set to the tune of "The French Can Can".
 * According to an interview with Buzz Dixon, the G.I. Joe episode "Cobrathon" was originally supposed to involve Cobra singing a "We Are the World" parody titled "We Want the World".
 * The animated short The Groovenians gives us "The Money Song" by King Norman (voiced by Dennis Hopper).
 * Western Animation's Ur Example would have to be Bluto's Expy Sindbad's opening number from Popeye the Sailor Meets Sindbad the Sailor.
 * Alejandro gets an awesome Villain Song near the end of Total Drama World Tour. Behold, This Is How We Will End It.
 * Although not much of a villain, but big enough a jerk to count, Blainley has the song "Blainerific".
 * There's also Versus for Alejandro and Heather. Worth noting is it doubles as a "The Villain Sucks" Song to each other.
 * Despite being a show circling around musical numbers, Class of 3000 has suprisingly few of these. One that stands out is Big D's song All We Want Is Your Soul, explaining that he wants Little D's soul as payment for making him famous.
 * Home Movies - In the "Starboy" epic, the Triumvirate of Evil's minion Mister Pants gets one.
 * "Mean Girls Rule" is an image song listed for the three Trix Witches in Winx Club.
 * Megas XLR. The Regis Mark V will destroy you with it's theme music.
 * In the episode of Hey Arnold! "Eugene, Eugene!", Arnold plays the Big Bad of the title play and gets a Villain Song called Nice Guys Finish Last where he sings about...well, the fact (in THAT ending) that he's won because The Hero was too nice a guy. In the true ending, he's instantly proven wrong.
 * Murky Dismal and Lurky of Rainbow Brite get a song called "The Pits" on the album "Paint a Rainbow in Your Heart".
 * Dr. Blowhole from The Penguins of Madagascar gets several in "The Return of the Revenge of Dr. Blowhole". Brand New Plan and I Wanna Control You. Brand New Plan is a straight up Villain Song explaining how the creation of a giant machine which is responsable for everyone singing in the first place wasn't part of his plans, but he can easily make it part of it. I Wanna Control You is pretty much a Villain Love Song to said giant machine in order to convince it to let him take control of it. The fact he's the best singer present is actually a plot point because it allows him to take control of the machine.
 * In The Real Ghostbusters episode "The Halloween Door" has the giant demon Boogaloo sing "The Boogaloo is Back in Town".
 * The Year Without a Santa Claus has Snow Miser and Heat Miser's nearly identical "I Am" Songs about how they're "too much".
 * Two out of three of the Van Beuren Studios Felix the Cat shorts had these: "Bold King Cole" had "You Talk Too Much, You Never Shut Up", and "The Goose That Laid The Golden Eggs" had "We Take What We Want and We Want What We Take".
 * Duck Dodgers as the Martian Queen, Tyr'ahnee, sing "Blues in the Night".
 * Cubix Robots for Everyone has Dr. K briefly rap "Who's the Baddest".
 * American Dad has "Psychotic Hot Tub", where a sapient hot tub (Voiced by Cee Lo Green, no less) tries to murder Stan.
 * Speaking of Cee Lo Green, he did another song on The Brak Show, in an episode featuring a rap battle between Brak and his character Prime Cut Miggety Moe Mack Daddy Jeezabang Doggy Dog Dog.
 * Also from Cartoon Planet, there's Zorak's cover of "Bad Boys" called, "Bad Bug".
 * Invader Zim Zim had an excellent villain song for the last episode. It involves him pretending to be Santa and rule the world by forcing people to obey him. It's more awesome than it sounds.
 * I'm a Shape Bandit. Please understand it. Shape Collecting is what I do. (14:55)
 * And then there's Three Terrible Traps (28:23)
 * Zilch also has a villain song which we like to call "You Won't Get the Key"
 * As for Squiddy, Well...
 * Tuff Puppy has an uncertain case, since it's triple-subverted.