I think this theme does well to capture a lot of that Eldar feel. Not really in that "futuristic" way, but it is just enough mysteriousness, mysticism, and ancient feel that I would expect from Eldar. Of course, the 1800's feel would be replaced, but otherwise I think it seems like elements like this would be very good for Eldar. Whaddya panzies fink?
A part of me almost wants something that ramps up over a relatively short period of time. Like the acceleration of their tanks. I was going to say "ramps up like shifting gears" but the Eldar technologies are probably like an electric car (one.. Or even no gear) so if the music builds at all.. It should be an unbroken increase in tempo.
I've posted these in earlier threads about eldar music, but I'll post them again. View: https://www.youtube.com/watch?v=77MzPshseR0 This is a good theme because the "race" it is for is similar to the eldar, and it sounds pretty good. View: https://www.youtube.com/watch?v=7X7KAa3i0JY Then I also like this one. It's not as "battle themed" as the others, but it still conveys a feeling of mysticism. Not sure where it would fit into the game, but it's still an example to go off of.
I'm thinking the Eldar's music should be som where in the range of symphonic epic music, with celtic folk type music, and some 80's synth. The first two minutes of this one make a really deep and longing type of atmosphere which I think fits well with the eldar. View: https://www.youtube.com/watch?v=Vma_cBmRHXw&feature=youtu.be This one with a bit more 80's sinth would be really damn good as well. View: https://www.youtube.com/watch?v=WSkCB6RkbdI maybe sprinkle something like this in the background to get the blood flowing. View: https://www.youtube.com/watch?v=4X9yAOcc7gU This one would fit well too. View: https://www.youtube.com/watch?v=gMFTmkXcjBA
I think music from Ergo Proxy would suit Eldar just fine: I think Eldar themes should be minimalistic and reveal as little as possible about their misterious nature.