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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Genre that originated from trance and/or techno, and eventually got a life on its own.

Pure Nightcore: VERY fast beats (sometimes so extremely fast, that you cannot count them), and very high pitch (almost chipmunks). Song usually lasts about 2 to 3 minutes. Often described as "cute".
Example: Kiss me by Schule321

Bass Nightcore: fast beats, the main melody (and voice) are pitched up, but there's very low bass added; so the contrast between very high and very low is created.
Example: Kiss me by GrizzNightcore

Trance Nightcore: fast beats, high pitch, but less signing and more melody; filled with repetition; very often there is only one verse or a sentence that is repeated throughout the song. Usually it lasts at least 5 minutes, often more.
Example: Kiss me by Nightcoremania
It looks like nightcore is getting more and more popular in these days.
by Goodnight_core April 21, 2011
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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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Eine Person, die ultra cringige deutsche Nightcore Lieder hört und sagt dass sie das Lied "fühlt" und "versteht" und sich eine Stelle im Leben raussucht, wo das Lied perfekt passen würde.
"Ich wurde in der 8. Klasse gemobbt weil ich ein Hurensohn bin und habe durch Nightcoring mein Leben wieder in den Griff bekommen"
by FetteFotze September 3, 2022
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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 20, 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 16, 2016
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