For a more classical style, one can always go with the music composed specially for the Druchii, straight out of Warhammer Online! The game has two Dark Elf-themed tracks on the official soundtrack,
Black Ark's Approach and
Blood Tithes. The Chaos-themed soundtracks,
The Bird God Wakes and
Embracing Pestilence, are pretty good for us too, but the Ork themed ones (though also good music) lack the eeriness that fits the Druchii so well and the ones for Order are much too heroic. Jumping to other Games Workshop-sponsored music, the
Dark Eldar Themefrom Dawn of War: Soulstorm is also very fitting.
The soundtrack to the venerable Warhammer: Dark Omen is also excellent, but recorded with old and inferior techniques
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I also second the vote for Two Steps from Hell, my favorite band. While I have yet to find a song of theirs that I dislike, and I'm frankly rabid about the majority of them, their Ashes album is probably the best for the Dark Elves; it's terrifying. For epic battle music, their albums Legend, Invincible, and Archangel are excellent. For somewhere between the two, Illumina, Dreams and Imaginations, Power of Darkness, and All Drums Go To Hell spring to mind. Personal favorite songs that retain Druchii darkness: Freedom Fighters, Protectors of the Earth, Tristan, Black Blade. I could go on.
For metal, definitely Nightwish. I need say no more.
(listen HERE)
Manowar is CLASSIC!
Have you heard 
) for my tastes (says she who likes Dimmu Borgir, lol!). I prefer my goth music with an industrial tone, like Ministry, Killing Joke, etc. However The 
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