[[quoteright:320: [[Series/BuffyTheVampireSlayer http://static.tvtropes.org/pmwiki/pub/images/btvs-once-more-with-feeling_2898.jpg]]]]

->'''Phineas:''' So what do you say? We'll do all the same things, but we'll break into spontaneous singing and [[SpontaneousChoreography choreography]] with [[InvisibleBackupBand no discernible music source!]]\\
'''Ferb:''' Hmmm.... What assurance would we have that [[CrowdSong everyone else would also break into song]] and do the same thing?\\
'''Phineas:''' I don't know. [[GenreSavvy I think they probably will.]]
-->-- ''WesternAnimation/PhineasAndFerb'', "Rollercoaster: The Musical!"

Once in a while, a show will shake things up and do SomethingCompletelyDifferent. One way of doing that is by turning the show into a TheMusical for an episode.

A Musical Episode is structured around the cast breaking into song (and possibly dance) throughout the episode. It might use an in-universe [[JustifiedTrope justification]], such as a BattleOfTheBands, some sort of [[AppliedPhlebotinum weirdness]], or a new [[TheMusicMeister character causing]] [[Series/BuffyTheVampireSlayer all this cheery singing]]. Alternately, it can play like a Broadway show where it's just taken for granted that some events will be dramatized through song and dance.

Opinions on a Musical Episode can differ wildly. Many will enjoy the up-beat, unexpected change of pace, while many will dis-like it for that very reason. Also, like any premise, the songs and choreography have to be good, or else you're doomed from the start.
----
!!Examples
[[foldercontrol]]

[[folder:Anime]]
* One episode of ''[[LightNovel/KureNai Kure-nai]]'' depicts the characters' attempts to rehearse a musical for a local festival, which eventually leads them to come up with their own material from scratch. It turns out that [[spoiler:it is a ploy by Benika to keep Murasaki entertained - which by and far succeeds]].
* ''NadiaTheSecretOfBlueWater'' had a [[ImageSong Character Song]] episode at the end of its infamous [[{{Filler}} Island/Africa]] arc.
* ''{{Kanamemo}}'''s fourth episode would be an amusing little story about the Fuhshin News employees attempting to get to the pool on its own, but the anime takes it a step further and adds song and dance numbers to the mix. No explanation is given for the singing.
** If it helps, Kana is as confused as the rest of us.
* ''OnePiece'': The TV Special Dance Carnival could be considered a dance episode (Dance special?). It starts on the aptly called Mirrorball Island. While trying to escape the Marines, Jango hypnotizes everyone to dance 'till they drop. Including the Straw Hats. Hilarity Issues.
* The [[GagDub English dub]] of ''Anime/DuelMasters'' randomly has Shobu and Kokujo be forced to come up with an inspirational song before they can duel.
* ''BoboboboBobobo'''s 48th episode had them defeat a foe by singing him into submission. Even by [[WidgetSeries Bo-BoBo's standards]], it's amazingly crazy.
* ''Anime/JewelpetSunshine'' had the characters performing ''Theatre/WestSideStory'' in one episode.
* ''Anime/{{Pokemon}}'':
** Though not really an episode of the show nor even canonical to it, the stage show ''Pokémon Live!'' would seem to fit in this trope.
** "Gotta Dance!", the short before the sixth movie.
* ''Anime/ValvraveTheLiberator'' delivered a rather cheesy musical moment in the end of episode 5, in hopes to get more supporters from both factions.
* Episode 17 of ''Anime/SpaceDandy''. Baberly Hills High School ranks students based on musical ability, so naturally this resulted.
-->'''Meow:''' The [[LiveAction/{{Glee}} glee]] [Dandy] must be feeling right now...
[[/folder]]

[[folder:Comics]]
* ''{{Nodwick}}'' had one of these, courtesy of Arthax and a "Scroll of Thespia".
* The ''Magazine/DoctorWhoMagazine'' strip "Planet Bollywood" has the [[Series/DoctorWho Eleventh Doctor]] and Amy land on a planet where everyone breaks into song and dance routines.
* The ninth issue of ''ComicBook/TomorrowStories'' featured a ''Greyshirt'' musical, as in a literal stage production; ''Greyshirt: Indigo Sunset'' later established that the man himself took the title role at one showing. Critics are astounded at Greyshirt's singing and dancing, claiming that he could've been another Creator/GeneKelly.
* The story ''Deadbeats!'' from ''[[HackSlash Hack/Slash Trailers: Part 2]]''. It involves zombies invading Broadway.
[[/folder]]

[[folder:Fan Works]]
* Several of the ''FanFic/CalvinAtCamp'' episodes, notably the movie parodies, are musicals.
* The 6th ''FanFic/TouhouM1GrandPrix'' had a [[RuleofFunny constantly interrupted]] duet as part of a BokeAndTsukkomiRoutine.
[[/folder]]

[[folder:Film]]
* ''SlumberPartyMassacreII'', where the villain is a spectral rockstar whose main weapon is an electric guitar outfitted with a drill. [[BizarroEpisode It's a very weird and random sequel]].
[[/folder]]

[[folder:Literature]]
* ''Spellsinger'', the fifth book of ''AvalonWebOfMagic''. A benefit concert and singing contest insert about three songs into the book...through just printing the lyrics in the text. Some of the songs were {{Defictionalized}} and released on CD to promote the book.
* ''Literature/HowMuchForJustThePlanet'' by Creator/JohnMFord is a Franchise/StarTrekExpandedUniverse novel in the form of a Musical Episode. All (almost all) of the songs are {{pastiche}}s of pre-existing songs so they'll be recognizable in text. Unfortunately this also means that filming it would probably be a massive copyright violation.
* The DragonridersOfPern novels ''Dragonsong'', ''Dragonsinger'', and (to a lesser extent) ''Dragondrums'', by AnneMcCaffrey all are about harpers, so it's justified that she presents the lyrics to many of their songs. (This happens to a lesser extent in her previous Pern books too.)
* Of ''Literature/TheFourGospels'', Luke is the one that has people bursting into song.
[[/folder]]

[[folder:LiveActionTV]]
* "[[Recap/BuffyTheVampireSlayerS6E7OnceMoreWithFeeling Once More, With Feeling]]" from the sixth season of ''Series/BuffyTheVampireSlayer'' - a fan favourite and CrowningMomentOfAwesome. The episode bizarrely sends up the musical genre (and its respective subgenres) as a whole, musical and dance genres from rock to ballet, and (in typical JossWhedon fashion) the series itself with wicked glee, yet also manages to fit plot and CharacterDevelopment in as well ''and'' come up with a plausible (for ''Buffy'') explanation for why everyone's singing.
** [[http://www.youtube.com/watch?v=d_fcXR6t14k&feature=related THEY GOT THE MUSTARD OUT!]]
** It was so well-known it made it into Channel4's top 100 musicals at number 13, above such notables as ''Theatre/LesMiserables'' and ''ThePhantomOfTheOpera''...
* ''XenaWarriorPrincess'' had two, actually. The funny one that parodied the "battle of the bands" type trope, and the (in some ways) more serious "Bitter Suite" episode.
* ''ThatsSoRaven'' did one in which Raven discovers that a talent scout is visiting her school, and thus everyone is breaking into song to impress the scout, whom they all mistakenly believe is the janitor.
* ''Series/EvenStevens'' did an episode titled "Influenza: The Musical" in which Ren has a [[FeverDreamEpisode fever induced dream]] in which the whole school would randomly burst into song, and Ren herself had to sing a song in the climax.
** "We went to the moon in 1969..."
*** [[CrowningMomentOfFunny "I've got chicken soup, delicious chicken soup soup ..." *cue Ren screaming in terror*]]
* ''Series/{{Scrubs}}'' did a musical episode (from the musicians of ''Theatre/AvenueQ'') based on the premise that a patient had an aneurysm that was making her hear singing when people talked. All the musical sequences were from her point of view, and after she goes into surgery, the music stops.
** The patient in question is played by Stephanie D'Abruzzo, who was the original Kate Monster in said show.
* ''SeventhHeaven'' had a Valentine's Day episode that was also a musical, called [[http://www.televisionwithoutpity.com/show/7th_heaven/red_socks.php Red Socks]].
* ''Series/XPlay'', a video game review show, did a ''surprisingly'' not horrible musical episode.
* ''Series/EliStone'' has musical numbers in most of its episodes.
* ''MalcolmInTheMiddle'' had an episode in which Dewey turns his parents fight into an ''opera''. The episode is appropriately entitled "Dewey's Opera".
* ''{{Lexx}}'' had its musical episode in ''Brigadoom''. In it the crew of Lexx encounters a mysterious theater floating in space and ends up performing Kai's backstory on stage. Of particular interest is the use of theater-grade special effects, so that a fleet of spaceships is represented by people waving miniatures on poles instead of the show's usual computer-generated effects.
** Actually, as the behind-the-scenes DVD material shows, some of the show's VFX were produced cheaply by manipulating miniatures on poles in front of a green screen, so the play version might be more of a self-referential parody.
* ''TracyBeaker'' did one.
* ''Series/That70sShow'''s 100th episode was a musical called, quite predictably, ''That '70s Musical'', only instead of singing songs written specially for the show, the characters sang some of the [[JukeboxMusical most famous seventies' songs]], as well as Music/TheTurtles' "Happy Together" from the sixties. [[spoiler: The singing scenes take place in Fez's imagination.]]
* ''GreysAnatomy'' had one. Similarly to the ''Series/{{Scrubs}}'' example, it was from the point of view of a patient; though the patient was one of the doctors in the main cast. She is played by Sara Ramirez, an actress/singer who was in Monty Python's ''Spamalot''. The episode wasn't very well received by fans.
* The ''TwoPintsOfLagerAndAPacketOfCrisps'' episode 'When Janet Met Jonny'.
* Once in a while, in TheSeventies, ''MisterRogersNeighborhood'' would invite an opera singer friend of Mr. Rogers named John Reardon, and the episode, entirely set in the Land of Make-Believe and featuring a lofty plot line, would resemble a musical or light opera, with all of the characters singing their lines.
* The ''Series/KamenRiderFaiz'' Hyper Battle Video, where the characters suddenly break out into song and dance for no apparent reason as part of Smart Brain's latest plot. They {{lampshade|Hanging}} the fact that they're singing, and in the end Takumi ends up defeating the Orphenocs with a sonic blast from a radio which was causing the whole thing. [[ItWasAllJustADream And then Takumi wakes up]].
* ''Series/ChicagoHope'' had the fourth-season episode "Brain Salad Surgery". Dr. Aaron Shutt suffered a brain aneurysm that caused him to hallucinate the rest of the hospital staff singing and dancing.
* On the heels of the success of ''Series/{{Glee}}'', FOX had a musical week including ''{{Fringe}}''. Which turned out to be a NoirEpisode as well-- a ''double'' case of SomethingCompletelyDifferent. And it was justified in that the noir musical was simply the fictional story within a FramingDevice.
* ''Series/ItsAlwaysSunnyInPhiladelphia'' had its musical episode where Charlie actually wrote and then directed a musical, not that his friends would let it be that simple
* ''Series/GoodTimes'' had two. One doubled as a ChristmasEpisode while the plot of the other was a talent show to raise money for a daycare center in their building.
* Every episode of ''Series/{{Glee}}''. Justified because it IS show choir.
* ''Series/AllyMcBeal'' had one at the end of season 3. Randy Newman wrote part of the music for this.
* ''Series/{{Oz}}'' has one of sorts. Series 5, episode 3 'Variety' has a central theme about variety shows and each of the narrator segments, usually occupied by Hill's musings about the theme is instead one of the characters singing in various different musical styles.
* The second season of ''Series/{{Community}}'' had [[Recap/CommunityS2E11AbedsUncontrollableChristmas "Abed's Uncontrollable Christmas"]] which, since it was also their homage to the Rankin Bass stop motion Christmas specials, had several short songs, and the third season ChristmasEpisode episode [[Recap/CommunityS3E10RegionalHolidayMusic "Regional Holiday Music"]] was a blatant ''{{Glee}}'' parody.
* Every episode of ''The Fresh Beat Band.'' Justified because it is about a band.
* Every episode of ''The Wiggles.'' Justified for the same reason.
* ''Series/{{Sanctuary}}'' had a musical episode. Justified because the reason they were singing was to communicate with Will's girlfriend, who had been [[spoiler:infected with a musical parasite]].
** But that doesn't cover all the singing such as Magnus spoken word piece.
* The "Land of the Luvvies" episode in ''Series/TheLegendOfDickAndDom'' features a much-feared tribe of {{Luvvies}} who [[TheMusicMeister spread song and dance]] through the neighbourhood.
* ''Series/LittleHowardsBigQuestion'' has an episode called "Can We Sing For A Whole Episode?".
* Every episode of ''CopRock''; justified what with it being, you know, a ''musical''.
* ''{{Smash}}''; see above, plus it's set in the world of musical theatre.
* ''Series/ToddAndTheBookOfPureEvil'' has a metal musical episode every season and straddles the line between playing it straight and justifying it. "The Phantom of Crowley High" had one inexplicable love song alongside an actual musical in the school. "2 Girls, 1 Tongue" justifies the singing as a side-effect of one of the Book's spells, but the cast does an unplanned number after the spell ends. Both feature a girl who hates musicals.
* [[{{Mega64}} Mega64!]] (Also the 2011 ''commentary'' for "Summer Semester".)
* ''Series/RaisingHope''. The episode about Burt turning out to be Jewish.
* "''Series/{{Psych}}'' 'The Musical". ExactlyWhatItSaysOnTheTin. Somewhat justified in that the entire episode is a pitch Shawn is giving to a playwright for a musical, so everything's in his cloudcuckoolander head.
* Many episodes of ''SesameStreet'' featuring a number of original songs. One notable example is "Music Magic" from 2010, where the story is told mostly through song as a result of a magic spell gone wrong by Elmo.
[[/folder]]

[[folder:Radio]]
* Episode three of the AudioPlay/BigFinishDoctorWho audio drama ''[[Recap/BigFinishDoctorWho043DoctorWhoAndThePirates Doctor Who and the Pirates]]''. As the story is being told through the framing device of the Sixth Doctor and Evelyn telling the story to one of Evelyn's students, it already contains a bit of storytelling silliness (Evelyn doesn't remember all the pirates' names, so she makes up obviously fake ones for the less-important characters), but when the Doctor takes his turn at telling the story, he decides, for LargeHam reasons, to deliver it in the form of a Gilbert and Sullivan musical. You could say that he's [[http://www.youtube.com/watch?v=hIdDXQ2h1Pc the very model of a Gallifreyan buccaneer]].
** As far as {{Cliff Hanger}}s go, this one is one of the most interesting:
---> '''Evelyn''': Oh no! You ''are'' going to sing!
---> '''The Doctor''': Well yes! I am! Llaaa-''[[[InterruptedByTheEnd cliffhanger theme music plays. Episode ends.]]]''
[[/folder]]

[[folder:VideoGames]]
* ''VideoGame/ConkersBadFurDay'' gives players a Musical ''BossFight''. "[[LargeHam Iiiiii, aaaaammmmmm, the Grrrreat Mighty Poo]] \ [[EarWorm ... and I'm going to thrrrrrrow my shit at you...]]"
* ''VideoGame/KingdomHeartsII'' also had a Musical Boss Fight, and a pretty good one at that. [[Disney/TheLittleMermaid Atlantica's]] UnexpectedGameplayChange has caused a BrokenBase, but it did have a fight against [[spoiler: a giant Ursula]].
** In addition to that, the 3DS version, ''VideoGame/KingdomHeartsDreamDropDistance'' had an entire world, [[Disney/{{Fantasia}} Symphony of Sorcery]], composed entirely of sound. Even the usual Keyblade sounds from hitting enemies are turned into music notes, and special attacks are accomplished by finishing a 'score'. Oh, and the protagonists [[SilentProtagonist only talk in the cutscenes]]. Given how it is based on Fantasia, and features entire scores of some classical pieces, this fits perfectly.
* In ''VideoGame/ChibiRobo'', almost everything you do causes a seemingly-random string of notes to play in addition to the background music.
* The final boss of ''VideoGame/ChronoCross'', while [[QuieterThanSilence not having any music playing while you fight]], has you [[spoiler: casting spells in the correct order]]. If you speed footage of this battle up, [[spoiler: the notes each spell gives off, played in the correct order, [[FridgeBrilliance is the credits theme]]]].
* ''VideoGame/TheNightmareBeforeChristmasOogiesRevenge'' has you defeating bosses with a singing retort going between the characters the entire time.
* The ''entirety'' of ''VideoGame/EpicMickey 2'' is one of these.
* Every single Live Event in ''VideoGame/AdventureQuestWorlds'' has been a musical episode. Especially Friday the 13th, when Voltaire performs. Alternatively, a story is written based only on a certain singer's work.
* Venice in ''VideoGame/Sly3HonorAmongThieves'' could be considered this, due to Don Octavio's plot to polute the city with tar unless everyone attends his opera during Carnival. Also, the final mission starts off as this, as the first part is Bentley performing a duet with Octavio.
[[/folder]]

[[folder:WebComics]]
* ''Webcomic/PennyArcade'' did this at least [[http://www.penny-arcade.com/comic/2005/11/14/ once]].
* ''Webcomic/InstantClassic'', which has had [[http://www.instantclassic.net/story.php?comicID=100 background scoring]] in it before, composed and created an [[http://www.instantclassic.net/story.php?comicID=207 actual musical number]] to play along with the comic as it was read.
* ''Webcomic/BrawlInTheFamily'' did it five times, soon to be six. The first was for Christmas 2008, a parody of [[WesternAnimation/HowTheGrinchStoleChristmas You're a Mean One, Mr. Grinch]]. The second was for Comic 200. The next three were for Christmas 2010, and the next one for Christmas 2012.
* ''Webcomic/{{Narbonic}}'' had a brief interlude in [[http://www.webcomicsnation.com/shaenongarrity/narbonic_plus/series.php?view=archive&chapter=40342&name=narbonic_plus one storyline]] to perform [[http://www.narbonic.com/MadbloodBattleAnthem.mp3 the Madblood Battle Anthem]].
[[/folder]]

[[folder:WebOriginal]]
* ''{{Fans}}!'' did this -- complete with fully-voiced [=MP3s=] linked beneath the panels -- mostly as a homage to ''Series/BuffyTheVampireSlayer''. Again, there is CharacterDevelopment as the cast is forced to sing their hearts out; in contrast to the generally painful revelations in ''Buffy'', however, this mostly helps ''restore'' the characters' spirits, reminding them why they do what they do. The arc's title, "Makin' 'Em Sing", hints at the fact that the entire thing was orchestrated by people eager to learn what the cast have been hiding recently.
* ''WebAnimation/HomestarRunner'':
** The Strong Bad Email [[http://www.homestarrunner.com/sbemail125.html Rock Opera]].
** Parodied in [[http://www.homestarrunner.com/sbemail139.html portrait]]. Strong Bad announces that this email will be a musical email, proceeds to start singing the email, then gives up after a few words.
** [[http://www.homestarrunner.com/onetwo.html This little number]].
* ''WebVideo/SailorMoonAbridged'' crosses this idea over with all Anime/{{Pokemon}} songs... The results [[http://www.sailormoonabridged.com/ are quite interesting.]]
* ''WebVideo/LastExileAbridged'' gives us [[http://www.youtube.com/watch?v=W2LCdDAaldg this beauty,]] which is not terribly surprising given that Unwardil is a musician. She Who Must Be Obeyed later makes him summarize the episodes properly.
* ''WebVideo/PrincessTutuAbridged'' did this for [[http://www.youtube.com/watch?v=3m-ndZnL-Bw Episode 12]]. Everyone was going out of their vocal range and/or having trouble with character voices and still manages to be enjoyable. Particularly a song about the famed reveal and ensuing [[PleasePutSomeClothesOn results]].
* ''TheLegendOfNeil'' did one in its second season.
* ''WebVideo/TheGuild'' has done a number of videos that could qualify as a Musical Episode.
* ''TheBatterysDown'' is a musical webseries, which means every episode is a musical episode.
* ''The [[DoctorSteel Dr. Steel]] Show'', Episode 3.
* ''WebVideo/StuffYouLike'' episode 10: a review of ''Theatre/LesMiserables''. [[http://blip.tv/stuffyoulike/stuff-you-like-10-les-miserables-in-song-5459594 To the tune of One Day More.]] [[TheCastShowoff In parts.]]
* ''ImAMarvelAndImADC'' did this in honor of their hundredth video. [[http://www.youtube.com/watch?v=IyPh8aIdR-4 CONTINUITY!]]
* ThatGuyWithTheGlasses:
** ''WebVideo/BrowsHeldHigh'' did a ''Music/DavidBowie'' themed musical episode for the movie ''Film/TheManWhoFellToEarth''. This was probably the first internet review show to have this type of episode.
** ''WebVideo/TheNostalgiaCritic'':
*** His ''Film/MoulinRouge'' [[http://thatguywiththeglasses.com/videolinks/thatguywiththeglasses/nostalgia-critic/33417-nostalgia-critic-musical-review-moulin-rouge review,]] which also featured collaboration with WebVideo/TheNostalgiaChick and Music/Brentalfloss, with cameos amongst others.
*** Since [[{{Uncancelled}} his return]], a collaboration with [[WebVideo/BrowsHeldHigh Oancitizen]] and [[WebVideo/PawDugan Paw]] on ''Film/LesMiserables2012''.
* ''WebVideo/TheTwilightChronicles'': "The Premonition" is considered a musical episode; however, only one musical number ("All Out of Love") is featured. Spenser Doherty's song "Cup of Coffee" was overdubbed with the real song due to his off-key singing and Gen Borg just danced to her song.
[[/folder]]

[[folder:WesternAnimation]]
* ''SpongebobSquarepants'': The movie "Atlantis Squarepantis".
** Several specials certainly qualify also. "Hello, Bikini Bottom", "The Sponge who could Fly", and "Spongebob's Last Stand" most notably.
* ''{{Squidbillies}}'': "America: Why I Love Her".
* ''WesternAnimation/TheSimpsons'' has done countless {{musical episode}}s, including "[[{{Evita}} The President Wore Pearls]]", "[[Film/MaryPoppins Simpsoncalifragilisticexpiala(Annoyed Grunt)cious]], "[[Theatre/MyFairLady My Fair Laddy]]," "[[TheSoundOfMusic Yokel Chords]]", "[[Theatre/SweeneyToddTheDemonBarberOfFleetStreet Treehouse of Horror XX: There's No Business Like Moe Business]]." and "Elemental School Musical".
** In addition, the show often parodies TheMusical, especially AllMusicalsAreAdaptations. See the former article for more information.
** There's also the ClipShow "All Singing, All Dancing," which highlights musical numbers throughout the first eight seasons. Almost all the framing sequences are entirely in song.
* ''WesternAnimation/SouthPark'' has done many musical episodes, too.
** Perhaps most notably, "Elementary School Musical" in which a new kid appears who is forced by his father to treat the world like a musical. Most of the school joins in.
** Including TheMovie.
* The last third of ''WesternAnimation/{{Futurama}}'''s "The Devil's Hands Are Idle Playthings" is an opera. As sung by the cast.
** There were also musical numbers in other episodes, such as "Hell Is Other Robots".
* ''WesternAnimation/{{Daria}}'', of all shows, had a musical episode aptly named "Daria!" And yes, Daria sings too.
** To be more accurate, she doesn't sing as such. More does the Rex Harrison talking/singing thing. Although her Dad and Trent have a killer heroic Duet...
*** She mainly talks in pitch instead of singing, but she ''does'' sing a few lines. Probably because she's just unmotivated, even in a musical. Perfectly in-character.
* "School's Out: The Musical", an episode of ''TheFairlyOddparents''.
* Except for possibly a few sentences, the ''entire episode'' "See Me Feel Me Gnomey" of ''WesternAnimation/ThePowerpuffGirls'' is completely in song.
** Which in this case makes it a RockOpera. In fact, the title of the episode is a reference to TheWho's {{Tommy}}.
** Same with the ''WesternAnimation/EvilConCarne'' episode "The Pie Who Loved Me" (though it was a significantly shorter episode)
** Same with ''WesternAnimation/TheGrimAdventuresOfBillyAndMandy'' episode "Little Rock of Horrors", which incidentally aired together with the above Evil Con Carne episode. It features a very catchy swing-type tune sung by a brain eating alien.
*** [[CrowningMusicOfAwesome Which was sung by]] ''Music/{{Voltaire}}''.
* ''WesternAnimation/RockosModernLife'' had the episode "Zanzibar", which was lampshaded throughout ("How did you all know the words?" "We practiced every Tuesday. Didn't you see the flyers?")
--> "R-E-C-Y-C-L-E recycle!
--> C-O-N-S-E-R-V-E conserve!
--> '''Rocko''': I told you it was catchy!
--> Don't you P-O-L-L-U-T-E
--> pollute the rivers sky or sea
--> or else your gonna get what you deserve"
** "And you know what they say..." - [[LampshadeHanging "It's going to be a song, isn't it?"]]
*** "We're a big unruly mob ..."
** ''Rocko'' writers Dan Povenmire and Jeff "Swampy" Marsh noted that with every episode they wrote (including the above "Zanzibar") they tried to work in a musical number, even when there didn't need to be one. [[WesternAnimation/PhineasAndFerb Guess what they ended up creating later.]]
* ''WesternAnimation/CodenameKidsNextDoor'' did ''two'' musical episodes: "F.O.O.D.F.I.T.E." (A heavy metal opera) and "L.O.V.E." (A WestSideStory-ish musical).
* ''WesternAnimation/PepperAnn'' had one. Pepper Ann was auditioning for a musical at school, fell off the stage, and blacked out; when she came to her life was a musical. [[AllJustADream It turned out to be a dream]] when she came to for real.
* ''WesternAnimation/{{Arthur}}'' did a music video episode: just a revue of musical numbers performed by the cast. It goes on about how wonderful libraries are. The songs range from the slightly embarrassing pseudo-rap "Library Card" to Brain's [[http://www.youtube.com/watch?v=MiB4dMwDFtg Crowning Moment of Awesome]]...
* ''WesternAnimation/KimPossible'''s "Rappin' Drakken" comes close to being a musical episode.
* ''WesternAnimation/DannyPhantom'' includes an episode told mostly in rhymes, like a Dr. Seuss story.
* ''WesternAnimation/RubyGloom'' did an hour-long episode called "Hair(less): The Musical".
* The ''WesternAnimation/BatmanTheBraveAndTheBold'' episode "Mayhem of the Music Meister!" is notable for having somewhat of an in-story justification: the story is about a villain with a hypnotic voice controlling the world through music. Probably the show's most audacious use of RefugeInAudacity.
** Although that doesn't explain Black Canary (and later, Green Arrow), breaking out into song on their own. Maybe they're just musical theatre fans.
*** "[[LampshadeHanging Was the singing really necessary?]]"
*** It also helps that the Music Meister is voiced and sung by Neil Patrick Harris.
* ''WesternAnimation/FreakyStories'' chose to tell the UrbanLegend of "[[HookHand the Hook]]" as a Musical Episode.
* ''WesternAnimation/{{Reboot}}'s'' recap of the third season in the last few minutes of the last episode (of the third season) does this.
* ''WesternAnimation/PhineasAndFerb'' has one or more songs per episode, not joking, but there's a number of full-fledged examples:
** "Dude, We're Getting the Band Back Together" has ''four'' songs, one of which was nominated for an Emmy.
** The ChristmasEpisode would also qualify.
** The "Wizard of Odd", a WholePlotReference to ''Literature/TheWonderfulWizardOfOz'', which has the added bonus of having its Musical Episode status {{lampshade|Hanging}}d at every possible opportunity.
** "Rollercoaster: The Musical" is a full musical episode based off the plot of the first episode, where most of the catch-phrases and running gags get their own songs.
** The movie "Across The Second Dimension" would probably also qualify, with eight songs, not counting the deleted one ("Mysterious Force").
* ''WesternAnimation/{{Rugrats}}'' had an episode where the rest of the babies try to teach Dil to appreciate music. To do so, they sing their own renditions (complete with reworked lyrics) of classic songs such as "Bicycle Built For Two," "You Make Me Love You," and "Pack Up Your Troubles."
** There was also the laundromat-set ''Theatre/WestSideStory'' parody "Wash/Dry Story".
* ''WesternAnimation/HeyArnold'' had "[[http://www.youtube.com/watch?v=Qe9FMOAlXlE What's Opera, Arnold?]]," an AllJustADream rendition of ''Carmen'' with the kids from the show.
* ''BugsBunny'' had a few based on classical music, including "''RabbitOfSeville''" and "''WesternAnimation/WhatsOperaDoc''".
* ''WesternAnimation/DextersLaboratory'' had its oft-quoted even to this day ''[=LABretto=]'' episode, which presents itself as an origin story chronicling Dexter's rise from birth to building his secret lab.
--> [[ArcWords "Hellooo, dear brother! What have you got there?"]]
--> "[[ImplausibleDeniability Nothing! Nothing!]] [[BlatantLies You only see air!]]"
--> "Don't be silly, I love you very much!"
--> (smash!) "[[PersonOfMassDestruction I guess I shouldn't touch.]]"

--> "Oo-oo-oo-oo-oo, what does this button do?"
--> "Oo-oo-oo-oo-oo, what does this button do?"
--> (pushes Dexter's belly button. Dexter cries.)
--> "Now I know that this button does: it make my brother cry."
** Another episode involved Dee Dee getting a song stuck in her head, where most of the lines were sung to the tune of it.
* ''WesternAnimation/CowAndChicken'' has one episode devoted to the school staging Cow's bizarre allegorical musical, "The Ugliest Weenie".
* ''WesternAnimation/CloneHigh'' had "Raisin the Stakes: A Rock Opera in Three Parts".
* ''[[WesternAnimation/TotalDramaIsland Total Drama World Tour]]'' is a musical '''season'''. Oh yeah, and it's required.
* ''WesternAnimation/TheMarvelousMisadventuresOfFlapjack'' has ''All Hands on Deck''.
* In one episode of ''WesternAnimation/{{Animalia}}'' a core spore blows and all the animals start singing everything they say.
* In one episode of ''Curious George'' called "Sock Opera Monkey", George does a puppet show of the opera ''Hansel and Gretel'' to a recording of the music. In another, "Go West, Young Monkey", although he doesn't sing, several other characters do. (Most of this is a dream sequence.)
* ''WesternAnimation/AmericanDad'' has ''Hot Water'', a parody of Theatre/LittleShopOfHorrors featuring Music/CeeLoGreen as a sentient hot tub.
* ''WesternAnimation/TheEmperorsNewSchool'': The Musical speaks for itself, really. Bonus for being a parody of ''HighSchoolMusical''.
* "Bad Rap" from ''TheSuperMarioBrosSuperShow''.
* ''WesternAnimation/SpaceGhostCoastToCoast'' had "[[http://www.snard.com/sg/ghostbill.html Boatshow]]".
* ''WesternAnimation/VeggieTales'' had "Lyle The Kindly Viking".
* The direct-to-video feature ''WesternAnimation/ScoobyDooMusicOfTheVampire'' is essentially a musical as the Scooby gang and the feature's incidental characters break out singing throughout.
* The ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' season 3 finale "Magical Mystery Cure".
** The season 4 "Pinkie Pride" is also a musical episode. With good reason, as Music/WeirdAlYankovic guest-stars as rival party planner Cheese Sandwich.
* ''WesternAnimation/{{Metalocalypse}}'' has songs in every episode, but season 3's "Rehabklok" was more of a cohesive musical.
** ''WesternAnimation/MetalocalypseTheDoomstarRequiem: [[PunnyName A Klok Opera]]'' is more or less a rock opera, with there being very few actual spoken lines present.
* The ''WesternAnimation/CatDog'' episode, "It's a Wonderful Half Life", where Cat and Dog have a shared dream InTheStyleOf a "rubber-hose" cartoon from TheThirties.
* ''WesternAnimation/MyGymPartnersAMonkey'' has a rather unique variation known as "Animal School Musical". The episode is justified in-universe as the result of a [[ItMakesSenseInContext magic wish gone wrong]] and the characters are literally ''forced'' to sing whenever the universe finds it appropriate.
* The ''ComicStrip/{{Popeye}}'' cartoon "The Man on the Flying Trapeze" has almost all the music and words played to the tune of the song.
** A number of other Popeye shorts (mainly in the Fleischer Studios era) are this as well.
* The second half of the hour long "Return of Doctor Blowhole" ''WesternAnimation/ThePenguinsOfMadagascar'' special is a musical episode. An incident involving a power cell, a device used to turn people evil and an MP3 player creates a machine that forces everyone to sing in it's field of effect. Cue the villain taking it over and the rest of the cast trying to stop it...all in song!
* Deconstructed in ''WesternAnimation/BobsBurgers'' with "Hamburger Dinner Theater" where Linda naively believes singing can make any situation better, even when they get robbed.
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