Nightcore
A nightcore edit (also known as a sped-up song, sped-up version, sped-up remix, or simply sped-up) is a version of a music track that speeds up its source material by approximately 35%, which also raises the pitch. This gives an effect almost identical to playing a 33⅓-rpm vinyl record at 45 rpm. The 35% increase in speed causes the note C4 to become slightly higher in pitch than the note F4 (from 261.63 Hz to 353.19 Hz), which is an increase of approximately 5 and one fifth semitones. Playing 33⅓-rpm vinyl records at 45 rpm was common in the Happy Hardcore scene of the 90s and 2000s, which most likely inspired this genre.
The name is derived from the Norwegian musical duo "Nightcore", who released pitch-shifted versions of trance and Eurodance songs. Nightcore is also almost always associated with and accompanied by anime and otaku culture; many YouTube thumbnails (and similar features) of nightcore remixes contain anime characters and art.
Nightcore saw a general resurgence in popularity in the early 2020s due to TikTok, causing major recording labels to officially release sped-up versions of their songs.
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