Classical music?

Much of Mahler, Wagner, and Anton Bruckner would fit this category, though as noted above, not all of their music is loud, fast an powerful. You may also want to check out the tone poems of Richard Strauss -

Ein Heldenleben ("A Hero's Life")

http://www.youtube.com/watch?v=_2-dLoWorUs

Also Sprach Zarathustra ("Thus Spoke Zarathustra" - you'll recognize the beginning of this)

http://www.youtube.com/watch?v=Y9QxaJLt7EA

Tod und Verklärung ("Death and Transfiguration")

http://www.youtube.com/watch?v=3D5Up1aYJJs

And of course the old standby, Tchaikovsky's 1812 Overture, the only piece with artillery actually written into the score.

http://www.youtube.com/watch?v=VbxgYlcNxE8

I'll give you a 'category' name instead, and that will follow on from Sofa King Good .. There's a whole era of composers that we group together for the sake of convenience. That era is called 'romantic music' or 'romanticism' (and it has nothing to do with (1) either love, or (2) being Italian, French, Spanish or Portuguese!). There's a ton of composers that get classified as being from the 'romantic era' -- and Wagner and Tchaikovsky are included there. Of course it's not true 100% (because there is plenty of 'soft' and 'gentle' in 'romanticism'), but you can also think of it, kind of, as the era of 'heavy metal in classical music.'

Another, if you haven't heard it:

https://www.youtube.com/watch?v=FsvpFU7KY7E

This above guy is another one of them. This one is a several compositions put together into a kind of 'suite.' Not all of them are loud compositions (there's a lot of contrast in this one suite), but I'm sure you can think of a couple of the individual pieces here as the 'heavy metal' of that time. Have fun listening, but also look up 'romanticism in music' on the Internet for more...

Ustvolskaya - Symphony 2 (probably the heaviest piece ever written)

http://www.youtube.com/watch?v=ynhdxHOrPm4

Gustav Holst - Mars, The Bringer of War

http://www.youtube.com/watch?v=L0bcRCCg01I

Stravinsky - The Rite of Spring

http://www.youtube.com/watch?v=wZtWAqc3qyk

Orff - O Fortuna

http://www.youtube.com/watch?v=GD3VsesSBsw

Wagner

1812 or the Soldiers Tale by Tchaikovsky

Plenty of good suggestions so far, and I would add the "Dies Irae" from Verdi's Requiem. Dies irae is Latin for "day of anger" and this is certainly the angriest one I've ever sung. "In the Hall of the Mountain King" by Grieg would be up there too.

Definitely Stravinsky (http://open.spotify.com/track/3TAnhkatsEyVDY9zdie5... , Aram Khatchaturian (http://open.spotify.com/track/7pPvDU4C4Shhqc5NppgC... Sergei Prokofiev (http://open.spotify.com/track/32F7ZGDKNuB5faDLNsTE... Arnold Schoenberg (http://open.spotify.com/track/3Z3GDkBC5De7bNv3rVLz... and Arthur Bliss (http://open.spotify.com/track/0a7zStNSN4zRc6Ntik6Y... These composers would rank in my top five most "explosive" composers.

I havnt listened to bet many composers .. But most of Mozarts pieces would have been considered bold/brash in his time ..

Beautiful doe !