Well actually they did have a very disco sound. But it wasn’t disco at all. It was more like a combination of classical and rock music, combined with synthetics. Very artistic from my point of view, and very worth listening to. The fact is that no one makes music like that anymore.
Now this is one of my fave instrumentals by them
Daybreaker
http://www.youtube.com/watch?v=vYaCCqvBtTg