what is nightcore

A nightcore (also known as sped-up song, sped-up version, sped-up remix, or, simply, sped-up [1] [2] [3] [4] [5] [6] [7]) 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.