[[quoteright:227:[[VideoGame/PlantsVsZombies http://static.tvtropes.org/pmwiki/pub/images/DancingZombies2_2442.jpg]]]]
[[caption-width-right:227:TheDeadCanDance + MookMaker = [[{{Troperithmetic}} You're boned]].]]
Whenever it's time for a musical number, the lead dancer and singer (whether hero or villain) can usually pull any {{Innocent Bystander}}s into a CrowdSong, and thanks to SpontaneousChoreography have them all dance and sing in perfect sync.

Some leads can go a step further. Rather than make do with whoever is nearby, or go solo if there's no one else around, they can Summon Backup Dancers from out of sight, bringing a battalion of ballerinas to dance at their side. To make this more impressive, they'll usually be summoned directly from the [[AlternateUniverse Universe]] of [[CostumeTropes Wardrobe and Costuming]] after having been fitted in perfectly appropriate attire for the song in question.

This trope isn't ''usually'' a magical spell that can summon dancers like a [[AWizardDidIt wizard]] can [[{{Mons}} summon monsters]] (though in a wacky enough series, it may well explicitly be one), more often it's an [[MusicalWorldHypotheses implicit rule of the cosmos]]. Anyone who goes into a musical number will get accompaniment, even if it requires the SpontaneousGeneration of said dancers from hard vacuum. Other times, it can be humorously [[JustifiedTrope Justified]] by the lead in question training friends, allies or [[{{Mook}} subordinates]] beforehand and instructing them to hide out of sight and march out on cue for their big song.

If this ''is'' a magical ability of some type, the backup dancers may help out by [[DanceBattler dance battling]] alongside the summoner.
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!!Examples:

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[[folder:Anime and Manga]]
* Extra ballerinas appear out of nowhere from time to time in ''Anime/PrincessTutu''.
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[[folder:Comic Books]]
* In ''ScottPilgrim'', Evil Ex #1 Matt Patel can summon Demon Hipster Chicks to help him cast his flaming hand attack. In the videogame, these attack the player.
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[[folder:Film]]
* In ''WesternAnimation/{{Shrek 2}}'', the Fairy Godmother enchanted Fiona's furniture to sing along with her about giving Fiona a makeover.
* Giselle's Disney-Princess magic in ''Film/{{Enchanted}}'' turns the jaded denizens of New York into her backup chorus, leaving her stodgy love-interest baffled that everyone seems to know the same song. "I've never heard this song!"
* In ''Film/TheMask'', the titular character does this to a SWAT team.
* Just like in the series, Matthew Patel summons his demon hipster chicks in ''Film/ScottPilgrimVsTheWorld''.
* In ''Film/{{North}}'' during the Texas song a group of back up singers and dancers appear out of nowhere, this is justified [[spoiler: as it was {{AllJustADream}}]].
* In ''Film/{{Leprechaun}} In The Hood'', the Leprechaun uses his powers to make the people in a night club sing and dance for him.
* Happen's during [[Creator/MadhuriDixit Janki's]] [[TheItemNumber Item Number]] "Badi Mushkil" in ''Bollywood/{{Lajja}}''
* In ''Film/TheBluesBrothers'', when Creator/RayCharles plays "Shake a Tail Feather", passersby in the street start dancing, and the crowd quickly grows as people rush in from all sides. They proceed to demonstrate the different 1960s dance styles that are mentioned in the lyrics.
** You see those people on the elevated train station way in the back? They weren't involved in the shoot. They were waiting for a train, saw what was going on, and joined in.
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[[folder:Live Action TV]]
* Nicely played with in ''Series/{{Buffy the Vampire Slayer}}'''s MusicalEpisode, "Once More With Feeling", as Buffy's confronting, via a musical number, the demon responsible for the whole mess...
-->'''Giles:''' She needs backup! Anya, Tara!
-->''(Anya and Tara take [[IncrediblyLamePun backup dancer positions]] and join in)''
** Played straight earlier when Tara is singing her love song to Willow "Under Your Spell". While dancing through the park she passes near two other girls resting by the pond who are compelled to rise to their feet and start dancing behind her.
* Ryutaros from ''Series/KamenRiderDenO'' not only has a summonable group of breakdancers (one of whom was the VictimOfTheWeek for Ryuta's spotlight arc), but his powers include the ability to make '''everyone''' nearby dance along with his theme music.
** In TheMovie (the first one), he even summons a kick line of chorus girls.
* Almost too obvious an example is ''{{Glee}}''. They don't do it all the time, since they actually have cast that are backup dancers, but there was a scene in the outdoor cafeteria that did that, and one in a mall, where bystanders joined in the action.
** Most notable are the Troubletones dancers who appeared in Chicago without riding in the team bus (which had plenty of room to spare for them).
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[[folder:Music Video]]
* A very, ''very'' big chunk.
* In the music video of Sara Bareilles' "Gonna Get Over You," she doesn't so much as summon her backup dancers as more [[TheVirus infect the shoppers of a Mexican supermarket]], turning them into her leather jacket-clad minions.
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[[folder:Pinball]]
* As with the TropeNamer, ''VideoGame/PlantsVsZombiesPinball'' has this during the "Gotta Dance" multiball mode.
* In ''Pinball/NoGoodGofers'', the "Dance Party" mode features additional gofers appearing to dance in sync with Bud and Buzz.
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[[folder:Theatre]]
* [[AvertedTrope Averted]] in the 1993 Broadway version of ''{{Tommy}}'', in accordance with composer Pete Townshend's strict instructions to collaborator Des [=McAnuff=] that there be "no fucking dancing."
* ''{{Pippin}}'' does this most obviously in "Kind of Woman," which brings a bunch of adoring backup singers come to Catherine's side. They disappear when the song is over, leaving her alone with Pippin as before (but not really, since the show has NoFourthWall).
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[[folder:Videogames]]
* ''VideoGame/PlantsVsZombies'' is the TropeNamer. The lead Dancer Zombie does this, summoning four backup dancer zombies.
* In ''RatchetAndClankUpYourArsenal'', evil robot pop diva Courtney Gears does this during her boss battle.
* In ''VideoGame/GuildWars'', the collector edition of the expansion ''Factions'' comes with a bonus that, among other things, gives Ritualist and Assassin characters ghostly backup dancers with the /dance command.
* In ''VideoGame/DragonQuestIX'', the ultimate Luminary skill, [[ShoutOut Disco]] [[WesternAnimation/TheSimpsons Stew]] has your guy doing a dance routine while a bunch of backup dancers appear behind him/her. [[ItRunsOnNonsensoleum Somehow, this does damage]].
* A spell in ''VideoGame/KingdomOfLoathing'' called "Raise Backup Dancer" lets you [[ExactlyWhatItSaysOnTheTin raise backup dancers from the dead]].
* In ''VideoGame/TheNightmareBeforeChristmasOogiesRevenge'', gaining enough musical notes in a boss battle sends you into a RhythmGame [[UnexpectedGenreChange section]]. Doing well summons skeletal backup dancers.
* ''VideoGame/SpaceChannel5'' has any hostages you rescue join you in dance.
* In most ''Franchise/{{Kirby}}'' platformers, Kirby clones himself and performs a HappyDance whenever he clears a level.
* ''VideoGame/WorldOfWarcraft'' features a quest where [[http://www.wowwiki.com/Lament_of_the_Highborne Sylvanas gets nostalgic and summons a backup choir of banshees]].
* When Edgeworth is introduced in the first {{Takarazuka}} musical adaptation of the ''VisualNovel/PhoenixWrightAceAttorney'' series he immediately summons a group of backup dancer clones for his intro song.
* Demyx from ''Franchise/KingdomHearts''. [[TimedMission Kill them all in 10 seconds]] [[ThatOneBoss or you die.]]
* This makes up the first phase of the fight with Armaros in ElShaddai.
* in ''VideoGame/FinalFantasyX2'' The first cinematic is of a concert with back-up dancers that appear via magic/hologram/goons.
* Any dance number Phantom R has in ''VideoGame/RhythmThiefAndTheEmperorsTreasure'' will feature two clones of Phantom R in all-black clothing dancing behind him, which the game never explains. Bizarrely, Jerome, an impostor Phantom R, also receives two such clones.
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[[folder:Web Comics]]
* There was a ''Webcomic/{{Sinfest}}'' strip where Slick and Co. tried to face off against a G-Man in a dance-battle - but when they were done, he just snapped his fingers to summon two other, similarly-dressed guys to act as his backup-dancers for a modified rendition of [[http://www.sinfest.net/view.php?date=2008-02-17 Here Come The Men In Black]].
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[[folder:Web Original]]
* ''InkCity'': When [[WesternAnimation/{{Animaniacs}} Yakko]] and [[WesternAnimation/RegularShow Rigby]] break into their TheVillainSucksSong "Pretty Fly (For a Toon Guy)", the first thing Yakko does is summon some random backup singers/dancers. ([[WesternAnimation/AeonFlux Trevor]] is completely distracted by this, and tries to charm the girls into defecting to his side, to no avail.)
* On ''TheLXD'', Sp3cimen has this power. When fighting other dancers, he can summon around four backup dancers who help him power up his Ra blasts and provide cool visual effects.
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[[folder:Western Animation]]
* [[InvokedTrope Invoked]] in ''WesternAnimation/PhineasAndFerb'', in the song [[http://www.youtube.com/watch?v=5rllzxZwN_Q Rubber Bands, Rubber Balls]], Baljeet's uncle, Sabu, summons his factory workers as backup dancers.
** Backup dancers sometimes appear if Doofenshirmitz tells Perry this week's {{backstory}} in song; he explicitly hired them at least twice. The trope is sometimes justified only by [[RuleOfCool Rule Of]] [[MST3KMantra Don't Be So Pedantic, It's A Cartoon]], such as when Baljeet sings about his fear a bad grade if he fails to make a portal to Mars - he summons not just backup dancers, but scenery and elephants too!
* An episode of ''WesternAnimation/TheBoondocks'' shows us Tom pining over Sara after she throws him out of the house. He then breaks into an Usher-style love song in the middle of the street, complete with back-up dancers who appear to be just neighborhood guys in their robes and pajamas. They perform perfectly until they are almost hit by a car.
* {{The Music Meister}}'s superpower in ''WesternAnimation/BatmanTheBraveAndTheBold'' is to hypnotize people with this singing. He thus makes backup dancers out of a horde of supervillains and superheroes.
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