It took me an ungodly amount of time to actually unlock Dracula's castle. That Albus fight is a fucking chore and I had to do it like five times!
Anyway, this is a remix of the opening theme which itself gets your heart pumping because not only is this a new Castlevania game, it's the classiest looking new Castlevania game ever! And the Castle is the climax! And the music is great! That is important because it's ridiculously hard and you'll probably need to farm it up a bit, so the music better be catchy!
http://www.youtube.com/watch?v=J1hfIUQqk8wAlbus is a pretty taxing fight and his theme is a pretty taxing theme. I am a big fan of the first five seconds leading up to the RAWK that provides the back-drop of a catchy theme with a tricky, elusive combatant. Bonus points for instrument choice(organ!) and overall drama.
http://www.youtube.com/watch?v=2-lrP9mX4QQ&feature=relatedFellows, Order of Ecclesia has a fantastic soundtrack that does not rely entirely upon Vampire Killer, Bloody Tears and Clockwork Mansion. Be a Guildenstern and play it.