iDOLM@STER isn't an anime(I'm not yelling at you, that is how the title is stylized)... except for those two times. It is a game franchise based around managing idol singers.
Nightcore: it doesn't always make the song better, but sometimes it does wonders to a song. For example, check out "Meet Me On The Battlefield - Nightcore."
I just HaTE that there's hardly any effort being put into these things and then people call them "remixes" n shit too like ??? um n o ?? laziness in art/music is just a huge pet peeve of mine I'm sorry