It's hypnotic, it's elegant but exotic, and the lyrics are totally evocative, chilling yet uplifting. The drumbeat off-kilter yet caught in some kind of trance, the solemn and ominous piano, the strings that threaten to carry you off into Thom's dream world...I can't say enough about it.
I brought Amnesiac home and listened to it for the first time on headphones, and have never wavered from my opinion that it's Radiohead's best work, even if the sum of the parts are better than the whole compared to their other albums. The diversity of styles found on Amnesiac still astounds me.