Author's Response:
1765 is really a pretty arbitrary year, but it's supposed to conjure thoughts of antiquity, and you'll notice it's just a short while after the baroque era.
The special effects obviously aren't supposed to be representative of the time, but you'll notice the choir and their gregorian stlye chanting seem to fit the theme, along with the not-so-counterpuntal piano part.
Personally, I would consider 'classical rock' to be any song that's hybrid of both classical (strings, choir, compositional arrangement) and rock music.
Thank you, as always for your review!