@zaire2d Williams always stated that Holst is one of his biggest influences, he also took a lot of ideas for the Star Wars score from Mars and Venus, but it's great to hear the similarities between two of the world's greatest modern composers ^^
Come along and join the group [url=http://www.last.fm/group/Orchestral+Composer+of+the+Week.]Orchestral Composer of the Week[/url]. Nominate your 5 favourite composers each week and see who gets into the Hall of Fame.
Only this mentioning it because of the argument already going on here about classical and heavy metal. Anyways, some forms of metal have nothing in common with it. In other styles there are certain aesthetic similarities, primarily the grandiosity and bombast. Also, metal (next to electronic music) can be the most complex music I've ever heard, excluding classical of course. Classical is more complex primarily due to the vast number of musicians involved, and thus the amount of layers a single composition can take on. People seem to make it out like classical is untouchable in it's intelligence and complexity, but this is simply not true. Classical composers may be brilliant, but to say there is no way writers of other music can approach their brilliance is ignorant and closed-minded. Metal I can think of off the top of my head that is most similar to classical would be the first 25 minutes of Twilight of the Gods" by bathory and Blind Guardian's song "And Then There Was Silence"