Contestants must be famous.
FOX//Getty ImagesThe idea for the competition came from a South Korean game show and was brought to the U.S. in 2019. Every episode, celebrities battle it out onstage in a singing competition — but there's a catch.
They can't reveal their identities until they're eliminated.
FOX//Getty ImagesThe contestants are forced to go completely incognito. We're not talking sunglasses and a baseball cap. They have to wear head-to-toe costumes.
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Stars get to choose their own costumes.
FOX//Getty ImagesThere's a set of pre-selected costumes that the celebs pick from and then are allowed to tweak them to their liking. Host Nick Cannon told PEOPLE, "Usually their costumes are a clue to who they actually are."
But seriously, nobody can know the truth.
FOX//Getty ImagesYou'd think the celebrity judges or the host would be able to sniff out who's appearing on the show, but they're all kept in the dark. No one except a small group of production employees knows who's competing.
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Only code names are allowed.
FOX//Getty ImagesCode names, like Fox, Night Angel and Unicorn are used to describe the alter egos of contestants. Since no one knows their real identity, the contestants are only referred to by this name until they're unmasked.
Celebrities must be in disguise at ALL times.
FOX//Getty ImagesBecause, say it with us now: Their identity must. remain. a. secret. Contestants wear hoodies to keep from being recognized on set when they're not performing. "They didn't see your hands, or your body, because we had to wear these big hoodies and balaclavas. It was very, very extensive in hiding who you were," season 1 contestant Margaret Cho told E! News.
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That includes during rehearsals.
FoxContestants must wear their costumes or hoodies and masks while practicing their performance for the upcoming week's show. Even the backup dancers aren't allowed to know who they're performing with on stage!
Tight security is a must.
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Contestants and panelists are not allowed to interact backstage.
FOX//Getty ImagesThe contestants are kept in an entirely separate area from the panelists on set. The only time the contestants can interact with them is when they're onstage in costume.
Even onstage convos should be brief.
FOX//Getty Images"We came to the agreement of like, OK, they're going to ask one question, and you can answer—with the scrambled voice, you know. You didn't want to test it too much because you could kind of hear the person, like through their cadence. If people talked a lot you, could probably figure out who it was," Margaret told E! News.
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Competitors can't talk to one another, either.
FOX//Getty Images"They kept us apart in that we were all scheduled to come onto set at different times. All of our rehearsals were at separate locations where we just had no idea. You never ran into anybody, I never crossed paths with any of the people," Margaret told E! News.
But stars do have their own guesses.
FOX//Getty Images"Towards the middle of the competition, once you were blended into a group, that’s when you got to hear each other, when you’re passing each other doing sound checks. So I had my suspicions..." season 2 contestant Wayne Brady told Entertainment Weekly.
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They have to perform in front of a studio audience.
Alberto E. Rodriguez//Getty ImagesEven though the show is prerecorded, the celebrity guest is still belting it out onstage in front of a panel of judges and a full audience. This is not the competition for a star with stage fright!
And yes, all performances must be live.
FOX//Getty ImagesNo lip-syncing here! Stars aren't allowed to pre-record their performances, no matter if they have any singing experience or not.
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Sorry, singers: No original songs are allowed.
FOX//Getty ImagesEven though some of the contestants are professional singers, original songs aren't featured on the show. Only cover songs are permitted, in order to not give anything away.
Audience members have to sign an NDA.
FOX//Getty ImagesSince the show is pre-recorded, the audience has to sign a nondisclosure agreement before they attend a taping, which prevents them from spoiling the results before the episode airs.
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Voices must be disguised at all times.
FOX//Getty ImagesWhile interacting with the panelists onstage, the voice of a contestant is autotuned and scrambled in a way that's unique to them and used throughout the season. This is done to keep them from being recognized, of course.
Speaking backstage isn't allowed.
FOX//Getty ImagesYou have to remain silent backstage unless you're speaking with one of the limited production members who know your identity, season 2 contestant Adrienne Bailon told Good Housekeeping.
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Stars can choose which songs they'd like to perform.
Joshua Sammer//Getty ImagesProducers work with the contestants to choose songs that not only suit their voice, but also fit that week's theme. From Vegas Night to Muppet Night, the show likes to get creative.
Clues provide hints as to who the stars are.
FOX//Getty ImagesThe contestants give the panelists and audience members a shot at guessing their identity though clue packages that are dropped before — and sometimes after — the performances.
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