About stage 7 song theme.Have you all forgoten Portrait of Ruin?You were collecting disc's with varius songs from the same game or other Castlevania games and you could use them as the stage sound track,that you were playing that moment.For example,you could use Belmonts theme on city of haze,even if it wasn't sound good on that stage.So after seeing that record collected with Maria and that they have mentioned about custom sound tracks,i think they have made the same think to this game and what we hear at the video,is a custom creation of that guy that play's.