Exceedingly difficult to describe properly. Most of their music is based off of piano and strings, some woodwinds and occasionally even some electronic work. It's chamber music-ish, but still manages to sound very contemporary. To a degree you can even hear the influence of the early/mid nineties mid-Atlantic "post rock" (god I hate that term) stuff, especially in some of the weird time signatures. Actually the drummer from Rodan was defintely on the first couple of records, I don't remember whether he remained in the band beyond that though.
Also it's about 98% instrumental.