Nightcore - Wikipedia
https://en.wikipedia.org/wiki/Nightcore
A nightcore (also known as sped-up song, sped-up version, sped-up remix, or, simply, sped-up ) edit is a version of a music track that increases the pitch and speeds up its source material by approximately 35%. This gives an effect almost identical to playing a 33⅓-RPM vinyl record at 45 RPM. This 35% increase in RPM causes the note C4 to become slightly lower in pitch than the note F#4 (261.63 Hz becomes 353.19 Hz) which is an increase of approximately 5 and a half semitones. Other names: Sped-up version, Sped-up remix, Sped-up song, Sped-up
Other names: Sped-up version, Sped-up remix, Sped-up song, Sped-up
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