Inspired by this thread.
For those of you more knowledgeable about the classical genre, I’m looking for those selections that just have to be listened to with the volume turned all the way to 11. Thanks in advance, I know you guys will educate my little redneck self. 
Well, I wouldnt consider myself “more” knowledgeable about classical, but i have seriously wanted to mosh to Carmina Burana
“o’ Fortuna” by Carl Orf. You will recognize it when you hear it.
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.
oops, sorry, Muab i used the wrong title(but seriously your honor i didnt think anyone would call me on it! heheheheh)
Beethoven’s 9th, the one performed in Immortal Beloved. Great movie, great song. Other renditions I’ve heard just can’t stand up to that one (does anyone know who did it?)
Wagner’s Ride of the Valkyries.
Preferably, in a helicopter.
Romeo and Juliet by Prokofiev.
Rachmaninov’s 2nd Piano Concerto
Mars, Bringer of War from “The Planets” by Gustav Holst.
1812 Overture by Tchaikovsky
Organ Symphony, last mvmt by Saint-Saens (symphony #3)
Night On Bare Mountain by Mussorgsky
The Great Gate of Kiev from “Pictures at an Exhibition” by Moussorgsky
Bolero by Ravel
Also Sprach Zarathustra (theme from 2001:a Space Odyssey)
The prologue to Boito’s, “Mefestofele”.
This one is rarely mentioned, but it’s quite grand.
Let’s see, Throne Room of Heaven is the setting?
Yeah, it qualifies.
Oh, I can’t believe I forgot In the Hall of the Mountain King by Edvard Grieg.
I notice a lot of these are on the Classical Thunder albums. Seriously, grab yourself a copy. The first one is a must; the second is great too, though it seems I’m in a slight minority there. But yeah, Classical Thunder is definitely worth it if you’re looking for that kind of music.
You guys are amazing. Thanks for all the input. I have a lot of new CD’s on my shopping list. 
Sorry, don’t have the opus and number handy, but some piano pieces:
The 3rd movement of Beethoven’s “Moonlight” Sonata.
Chopin’s “Revolutionary” Etude in C Minor.
Prokofiev’s “Tocatta”
Liszt’s “Hungarian Rhapsody #2” (Tom and Jerry got me turned on to Liszt.)
The overture to “The Flying Dutchman”.
Respighi - Pines of Rome
Strauss - Ein Heldenleben
Stravinsky - Rite of Spring
Hindemith - Mathis Der Mahler
Tchaikovsky - 4th Symphony
Mozart - Requiem
The Firebird Suite by Stravinksy
Symphony No. 1, The Titan by Mahler
Requiem by Verdi
and the biggest baddest classical butt-kicking of them all…
Symphony No. 2, The Resurrection by Mahler
Mars, Bringer of War from Holst’s The Planets has been ripped off of in movie scores almost as often as O Fortuna. One noteable example is the opening battle in Gladiator.
Me, I crank Rachmaninov’s 2nd Piano Concerto (as played by big R himself) but I’m a sucker for emotional pieces like that.