When you gotta sing, when you gotta let it out."
The Music Meister is a character who causes others to break out into spontaneous song and/or dance. Often used as a justification for a Musical Episode, in which case Genre Savvy characters will question (possibly in song) why they are suddenly acting like characters in a musical.
To qualify as The Music Meister, a character must have an explicit power to cause others to break out in song, and the musical interludes should be commented on as being out of the ordinary.
- Remarkably for a Japanese work (where Musical Episodes are uncommon in the first place), Duel Masters Victory V3 has an episode about a wannabe singer whose magical companion causes others to break out into spontaneous shouts, and eventually, singing and dancing. The main characters even sing the jingles during the eyecatches.
- The Muse from the Doctor Who comic strip "Planet Bollywood" in Doctor Who Magazine. The Muse was a robot created by the ruler of a planet to induce courtiers to perform musical routines against their will. An insurgent faction realised her powers could be used for evil. Smuggled off-planet, she was damaged in a spaceship crash and started inducing random musical outbursts in the local inhabitants.
- In one Nodwick story, Yeagar becomes this accidentally, after he asks Artax to cast a spell on him, to give him more impressive speaking skills. Of course, Artax never really read the full description of what exactly the spell does... so of course, EVERYONE (heroes and villains alike) start randomly singing together in the middle of the fights. The expressions during some of the songs are truly priceless.
- The Uncle from Songs Uncle Sings is a low key example.
- A Gem in the Rough: In a nod to the Trope Namer, Genevieve's newest ability "Color Trap: Musical Deep Blue" forces whomever is inside of her range to break out into spontaneous song and dance...despite there being no musical accompaniment. This can even effect strong-minded people like Captain Hina, who used the lyrics to show her disgust at the situation. Unfortunately, this includes her herself as well, much to her own embarrassment.
- Pokemon Opal And Garnet: Clopin. He got an ENTIRE crowd to sing "Topsy Turvy"... or at least its PokeLatin cover. In addition, his "Court of Miracles" battle style has left many Pokemon baffled.
- Giselle from Enchanted, who comes from a universe where random musical numbers are common. Only a few characters seem to notice that the singing and dancing is out of the ordinary.
- On The Mask, the title character is surrounded by police, so he starts singing a rumba number and the policemen start singing and dancing along, to their great surprise.
- In Leprechaun in the Hood, the Leprechaun uses his powers to make the people in a night club sing and dance for him.
- The Signature Scene of Hocus Pocus has Winifred enchanting a town hall full of partygoers to literally dance themselves to death. Doubles as a memorable Villain Song too: "I Put A Spell On You".
- Ghosts can apparently do this in Beetlejuice, as the Maitlands demonstrate during the sequence with "Day-O (The Banana Boat Song)" by Harry Belafonte.
- Not a person, but otherwise along the same lines, is Rojahama's Song-and-Dance from the Doctor Who New Adventures novel Sky Pirates!. It's a force of nature, or perhaps some kind of meteorological effect, that causes spontaneous outbreaks of Crowd Song. (The planet on which this occurs is in a solar system that, for reasons explained later in the book, is basically one giant Weirdness Magnet.)
- The demon Sweet from the Buffy the Vampire Slayer musical episode "Once More, with Feeling". Upon his arrival in Sunnydale, everyone in town begins breaking into musical numbers. While this seems harmless enough, the songs are always brutally honest ones that reveal people's deepest secrets, which sows discord among the populace. They also cause certain victims to spontaneously combust.
- Solan in Xena: Warrior Princess qualifies as this, as he is the driving force behind Xena and Gabrielle's being transported to the musical world of Illusia after they tried to kill each other.
- Also from Xena, Terpsichore's Lyre, from "Lyre, Lyre Hearts on Fire" is an inanimate version of this, as the musical aspects of the episode only begin when the Lyre is unearthed by Draco, and are abruptly ended when the Battle of the Bands is won. By Xena.
- The Imagin Ryutaros from Kamen Rider Den-O has the unique power to make everyone around him spontaneously burst into breakdancing with his theme song in the background just by snapping his fingers. After the first time, he even has a 'posse' that shows up whenever he wants someone to dance with.
- In the third season of Community, Mr. Rad not only acts as a Music Meister, but slowly converts the study group into Mini Music Meisters.
- The Luvvie tribe in The Legend of Dick and Dom episode "The Land of the Luvvies" has this effect on people.
- A 2010 Sesame Street episode had Elmo take on this role by pure accident - he decided to play with Abby's wand when she left it behind after leaving to do an errand; he accidentally learned the music spell while pretending to be a conductor with it and decided to use it on everyone on the street. There's even a Shout-Out to the Buffy example, specifically the "They Got The Mustard Out" song.
- The Flash had a musical crossover with Supergirl, with Darren Criss in the role of the trope-naming Music Meister. Unlike most examples, it being a musical wasn't an explicit power of the character; he trapped Barry and Kara in a shared dream world based on their own minds, which happened to be a musical. He was given the name by characters who didn't know how his powers worked. Also, he was more The Trickster; in the end he wanted them to learn something that was actually intended to help them, and is actually an otherworldly entity similar to Mr. Mxyzptlk who let them think he was just another villain with a weird power at first.
- Jude in the Big Finish Doctor Who episode "The Rapture".
- The Thrilling Adventure Hour: The Sparks Nevada episode "The Piano Has Been Thinking" features a player piano with artificial intelligence spreading radiation that causes the folks of Mars to randomly burst into song and dance.
- The cursed piano in the Storyteller skit in season 6, episode 6 of John Finnemore's Souvenir Programme gives its owner a wonderful singing voice while at the same time causing them, and everyone around them, to sing involuntarily. And then eats them.
- The Balladeer and, to a lesser extent, the Proprieter in Assassins have elements of this.
- Although most of of the songs and dances performed by Professor Harold Hill from The Music Man are simple outgrowths of him being the main character in a musical, his repeated evasion of the school board crosses into this trope. Whenever they try to check his references as a music teacher he cons them into singing classic Barbershop Quartet standards. He then escapes while they complete the number. The school board members are described as hating each other and are fully aware of what he is doing, but find themselves unable to stop their 4 part harmonies.
- The stage version of The Wizard of Oz often includes a Cut Song from the movie, "The Jitterbug," in which a literal bug causes Dorothy and company to break into a frenetic jitterbug.
- Ratchet & Clank Future: Tools of Destruction: The Groovitron, a miniature disco-ball shaped device that forces every NPC on the screen to dance until it runs its course. Notable in that every species/significant NPC has a unique reaction to it — you even get a skill point for targeting everything that can dance.
- LEGO The Lord of the Rings:
- In The Lord of the Rings, equipping a treasure called the "Disco Phial" allows you to see in the dark, while causing everyone in the immediate area to dance uncontrollably — which can be a pain if you're in multiplayer mode and your partner does this.
- The Hobbit has the Mithril Rhythm Stick, which plays a dubstep remix and causes players to dance. Using this and the Dazzle Wig and Mithril Dance Boots treasures together will give you the "Lord of the Prance" achievement.
- The Trope Namer is the Music Meister from the Batman: The Brave and the Bold episode "Mayhem of the Music Meister", a hypnotist who can command people to do his bidding (forcing them to sing and dance as well) via song. He doesn't have to sing his command, he just has to sing anything.
- In My Gym Partner's a Monkey Presents Animal School Musical, the magical fish David Coppertrout grants Jake's wish to turn the world into a musical. The other characters are not impressed, even to the extent of singing songs about how terrible it is living in a musical.
- In The Penguins of Madagascar episode "The Return of The Revenge of Dr. Blowhole", Dr. Blowhole's new device accidentally fuses with an experimental power cell and an MP3 player to form a machine capable of doing this. Blowhole himself becomes this when he takes control of it. Like the Trope Namer, he's voiced by Neil Patrick Harris.
- A device rather than a character, the Tone-O-Tuner from the Transformers: Rescue Bots episode "I Have Heard the Robots Singing" inadvertently causes all of Griffin Rock to break out in song.
- Miraculous Ladybug:
- Guitar Villain in the episode of that name. His "Rockin' Riff, Baby!" forces people to dance and shout like they're at a rock and roll concert.
- Frighteningale has a variant of this power. Victims of her power can choose to stop dancing and speaking in Rhymes on a Dime, but get turned into statues the moment they do.
"Put a sock in it!"