the references here can reflect any media, either indirectly (hinted apon) or direct reference, eg an actual name or scene is depicted, fan games where the characters appear as sub characters is fine as well, eg, mario blue twilight, and i wanna be the guy, Touhou's game should be listed in here as well, just for the over stage, sounds and sprites used, to add to the list:
Band: 64Revolt
Album: What A Horrible Night To Have A CurseGenre: 8-bit / Electropunk / Electroclash / Female Vocal
Country: Sweden
Robot Chicken: Castlevania spoof (warning not for the younger, contains language...)
Castlevania in Robot Chicken