A nightcore edit is a version of a track that speeds up the pitch and time of its source material by 10–30%. The name is derived from Nightcore, a Norwegian duo who released pitch-shifted versions of trance and eurodance songs, but now more broadly refers to any sped-up cover. Nightcore is also commonly associated with anime, with many YouTube thumbnails of nightcore remixes containing anime characters and art. Some may also come with an audio visualiser.