Nightcore as in the sort of sped up music phenomenon or nightcore as in some band I do not know? If it's the former I used to dabble in a bit of nightcore music when I was a wee lad (like, 10) but it didn't really stick, I have a rule against altered versions of songs I already like in my brain for little to no reason so I get bothered if they become fast, I like that one song the meme one the Rockefeller Street one but that's because I didn't know the original before listening