I haven't even given a shit about Harmony of Despair but HOLY MOTHERFUCKING SHIT THIS IS GREAT AND MY BODY WASN'T READY!
Castlevania Harmony of Despair OST - Heart of Fire (Theme of Julius Belmont)
This is actually a remixed version of music from the arcade game "Haunted Castle"
Listen for yourself
And a remixed version of the music from the Konami Famicom game "Getsu Fuma Den". Because for some CRAZY reason they put getsu fuma in the game as DLC. Weird.
And here is the Original.