As an answer for the question, yes. Not an absolutely yes, only when the direction is very careful.
In my oppinion, since the beggining Castlevania music was "very lively", for a Dracula-theme video game. Just hear to Wicked Child in CVI. In every game (correct me if is not true), the games has music from calm rhythm to a more lively one. So yes, for me the saga can have electric guitar or rock music in it, as long as its identity remains untouched...
...and, what about that combination with vocals? I love Trezier de Spirit
