The type of music that started as a subgenre of trance and is still considered so by many people. Trance fans usually call is happy hardcore. However nightcore fans prefer to not be associated with trance and don't like the idea of naming a "nightcore" as anything else.

Nightcore is characterized by a sped-up melody (sometimes), fast rhythmic beat (usually), and ALWAYS higher than normal pitch. Almost all nightcore music are original songs nightcored (remixed into nightcore) by nightcore fans.

Very popular is a belief that nightcore is a nickname of a person who remixes the songs. In reality anyone who knows how to use a computer can nightcore a song and upload it on Youtube.
"Do you like trance?"
"No."
"So why d'you listen to it all the time?"
"I don't!"
"But even right now you're listening to happy hardcore!"
"It's called nightcore!!"
by nightcore_fan June 18, 2010
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Almost always refers to a song that was initially trance or dubstep, sped up to the point where the lyrics sound like they are being recited by a hurried chipmunk, featuring a strong beat which is is audible but barely discernible. The song is then posted on YouTube, usually giving no credit to its initial creator, accompanied by a visual of an anime girl (or multiple anime girls).
"Back in my day we used to play 45RPM records at 78RPM just for shits and giggles, but nobody ever called it nightcore."

"I used to listen to music while I was on speed, but now I quit the speed and just listen to nightcore instead."
by longest johnson November 7, 2012
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A sped and pitched-up song with an anime picture to attract the weeaboos. Mostly used my moneyholics to claim all the revenue for a song whereas the original creator gets none. Some go as far as to discredit the original creator.

Nightcore was originally created by Thomas S. Nilsen and Steffen Ojala Søderholm and the moneyholics attempted to emulate their style before being corrupted into the wicked souls they are now.
"Hey, have you heard that new Nightcore song?"
"Shut up! Nightcore is for weeaboos."
"No, it's not! Energized was amazing!"
"Yeah, the originals were dope, but the one right now are complete shit. They're just rip-off's of chipmunking."
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1) A trance music duo consisting of Thomas S. Nilsen and Steffen Ojala Søderholm, started in 2001

2) A glorified term for one of the laziest forms of remixing: speeding up a song and pitching it up, which takes 30 seconds in Audacity. It comes from people trying to emulate Nightcore's style.
Nightcore is awesome, if you're talking about the music duo. If you're talking about the lazy remixes, then nightcore is trash.
by RandomMusician June 19, 2014
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The retarded version of music that should be considered copyright. It's pretty much just music with squeaky voices for weeaboos.
Have you listened to Nightcore
by JacksDefinitions May 15, 2016
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A sad excuse for a genre of music.

Nightcore is a genre of music mostly made up of sped up songs, such as good music from the band "groove coverage" wich the "Nightcore" versions have more views than the originals.

A "Nightcore artist" uses programs like windows movie maker, or camtasia studio to add a picture of what is usually a girl from a japanese anime, and they speed the music up a bit and call it original and a "remix."
by The_Dank_Memelord November 4, 2015
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A collection of remixed top 40 pop songs fawned over by 11 year-old females that discovered the internet, anime, and music the night before. The remixes are created by speeding up any given song to 320BPM and kicking up the pitch enough so that Alvin, Theodore, and Simon froth at the mouth. These songs are always accompanied by a lowres JPEG taken from Fanpop of a random anime girl with no connection to the song and uploaded to Youtube under an account name consisting of a nonsensical Japanese word and a collection of numbers placed there in order to warrant the username available.
"nightcore is the most awesome genre on the planet d^u^b"
"Right, and Canada is the most awesome country on the planet."
by Elepant June 17, 2013
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