I always did love the Song of Aeolus. Especially the beginning part, with the ethereal voices just singing the random notes...
La la so fa mi so la ti do ti la so fa
la la mi la la ti la
re re do ti la ti la
But then they sing it as a round, and it just sounds three times cooler. Then, of course, there's the rest of the song, which is full of random lower horn music and sound ve'y coo' indeed.

The prelude is sort of hypnotic, though. Something you can get lost in, listening to. I do love Adiemus, I do...