I agree with everything that TheKeyboardGuy said

Nice!

Cool idea, and it works too! A few tips though:

1. Everything needs a bit more 'oomf', especially the lower guitars.
2. With the lead guitar, it does sound a bit techno, which is cool, but probably stick to either guitar-sounding or techno-sounding, not both.
3. There's something about the drums that I can't quite put my finger on...

But yea, this is really good stuff, keep it up!

Great remix

I usually dont listen to metal, but this song was great as a classical piece and sounds perfect to go in one of the DOOM games, it just has such a great style that vivaldi put into it, that it rivals all forms of music in this modern world being able to stand out and then conform but revolutionize the newer genres like metal and techno. Great job keep it up.

Getin' Medival... or Whatever

Cool song. Sounds like a kinda electronic take on medival cathedrals. Reminds me of a combination of Dragon Quest and Castlevania. Love those games. Anyways, loved the cool echo effect at around 0:30. Cool. Keep em' comin'!