I agree adornable, ramien1271 is right on, and very eloquently put, I must say! I've always liked how they keep the rhythm an important part of the work, but not overwhelming. There is an intensity, but not overpowering.
Absolutely some of the best, highest-qual i t y ambient music out there. Amethystium projects a mystical, ancient, pulsating feel through their music, thoroughly mysterious and otherworldly , yet completely modern in its approach. The music is mature and sophisticate d , but never boring, and the beats are always subtly tied to the song - never muzak or smooth jazz, but not so booming that it disrupts the song's essence, beautifully balanced between modern electronica and ancient world music.