A genre of music where a relatively popular song is taken and sped up to sound like it's being sung by an anime girl. It is generally thought that nightcore is listened to by many Weaboos, because of the fact that it's supposed so sound like an anime girl.

usually "nightcore" is taking a good or a semi-good song, speeding it up and putting it in a higher pitch and then putting a techno beat on it. then you put your name on it because your a "music artist"

Some shit genre that is just a speed up version of songs and therefore takes no talent to make and infringes on copyrights.

A music "genre" made by a bunch of weebs who think that speeding up a song is considered a genre of music.

It, most of the time is just taking a song and, speeding it up, slowing it down, pitching it up, or pitching it down, with an anime character shown in the video.

A made up genre of music in where an original artists music is sped up an pitched up. Often then released on YouTube or similar sharing site with an anime based video as an original piece giving no credit or royalties back to the original artist. Basically an easy way for some non-talented schmuck to ride the back of a real artists work to gain some kind of notoriety for themselves.

Basically, sped-up music and the bpm (beats per minute) rises. It's a type of techno that originated in the early 2000's.

Nightcore is a genera of music that is sped up. The pitch can be higher due to being sped up.

Not all nightcore is the same. Different creators create it differently. However, they should all have the same aspect of being sped up with a pitch change. Just don't expect every Nightcore to sound the same. (Unless it's from the same creator)

Nightcore is commonly associated with anime and relating things. So expect to see a lot of anime character as the background to Nightcore videos on YouTube.