Mmm... the library... the caves... the forest... the treasury... the chandeliers... the rotating room... It's all top notch music!
Also, CV4 somehow comes across as the most "modern" of the oldschool vanias. It feels more polished than both Rondo, Chronicles, Bloodlines and ReBirth. To think that the game is almost 20 years old blows my mind. It's sooo slick I could die.
Some of the background graphics are weird though. You can't always tell what you're looking at. It's been a while since I played, but I always wondered what is going on in the background of stage 1. It looks like a horse and then something..else... lying beside it. When I was a kid I thought it was a dead person with the horse standing next to it. I wish I could find a screenshot... I believe it's visable in the room where you first encounter the medusa heads and the flipping floor bits...