Our Halloween festivities conclude with Soma playing a giant piano. Wasn't able to find a secret to this: It's just a giant piano, and it's there, so you can randomly play it before continuing on your way. These games are so stylish.
Side Note: So it seems that the 1999 battle between Julius and Dracula was actually the final resurrection of Dracula and he's defeated for the rest of time. Julius' 1999 battles being essentially the final battle of the Castlevania timeline (not counting Soma's future antics) makes it even weirder that we never got a game based around it.