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Technology that heavily involves music, usually either activating things, or somehow being a power source.
This cannot be music for puzzle solving, or things like that. It has to be technology using music.
Name is a pun on the term "discotheque".
Magic Music is the magic counterpart to this trope.
If the music is used as a weapon, you're looking for Musical Assassin.
- Senki Zesshou Symphogear features ancient power armours that run on "phonic energy", also known as singing.
- Major Domo in Captain EO.
- Duran Duran's "Orgasmic Organ" in the Barbarella movie.
- Willy Wonka has a door with a musical lock, opened by a piece by Rachmaninoff.
- Masters of the Universe has the Cosmic Key, a device that is capable to open portals the destination of which depends on the notes that are played on it.
- The Star Trek: The Original Series episode "The Paradise Syndrome" features a potentally world-destroying asteroid held at bay by a repulsive field that is controlled through the use of music
- In Chrono Trigger, the cathedral of the Middle Ages features doors that can be opened by playing a nearby organ.
- In Mother 3, you can perform combo attacks by pressing the A button to the beat of the battle music. This feature is described in-game as a "sound battle".
- The Andrew Hussie Web Comic And It Don't Stop.
- Agatha Heterodyne, Girl Genius, controlled her circus clanks through music.
- The lost city of Tinnabula from the two-part Tale Spin episode "For Whom the Bell Klangs".
- A Disney Silly Symphonies short "Music Land" involved a war between anthropomorphic violins and horns, playing their music as weapons.
- There's an episode of Batman the Animated Series which involves playing the beginning of "Ode To Joy" to unlock the secret room.
- The girl's voice in Rock and Rule was significant to help Mok with his summoning spell.
- While not strictly musical, the principle behind acoustic refrigeration relies on resonating sound. The effect is something close to a real-life version of Maxwell's theoretical demon.
- The Zeusaphone is essentially a Tesla coil that shoots lightning, tuned in such a way as to produce musical notes.