Beethoven and Strauss are good for ye olde thunderous music, and Vivaldi's violin concertos. Try Beethoven's fifth, it's got some v clangourous moments.
Holst's Mars, as someone mentioned (get the whole album btw, it's awesome)
Overture 1812 by Tchaikovsky. Can't beat those chimes
And there's this part of Sergei Prokofiev's Romeo and Juliet ballet suite that always scares the bejesus outa me. Listen to the whole suite, though.