And these are not quite (mosh)-pit worthy, but when I think of classical music that rocks and should be listened to at high volume, I think of most of the tracks on the soundtrack to Conan the Barbarian (best soundtrack ever, IMO) and several tracks from FOTR (especially the Balrog fight scene)
Come to think of it, Conan is partially based off of Carmina Burana, and FOTR certainly sees the influenced of both of them.
Oddly enough, even though all are 20th century/early 21st, and thus could be accused of being more “modern” than what people are looking for in “classical”, they purposely look back to the medieval or even earlier period for their musical inspiration.* Thats what I like about them.
(As a general aside, IMO baroque, renaissance, and “early” music “rock” more than classical/romantic, although i wouldnt play them any louder than i would the later periods.)
*okay, maybe FOTR doesnt do this purposely, but it is difficult to imagine writing a medieval-ish fantasy score without paying indirect homage to the other two compositions.