stealing from an Amazon review
Karlheinz Stockhausen was one of the most significant composers of the late 20th century, a contemporary of Boulez and Berio, successor to Webern, pioneer of electroaccoustic music and a wholly original voice in modern music.
There are going to be people reading this review for whom the music itself, indeed Stockhausen's music generally, is entirely new. What should you expect? Music that is intense, exciting, original, but also uncompromisingly modern: don't look for tunes, there aren't any!
As a devotee of 20th century modernism, I love this music and would recommend it to anyone with a bit of adventure about them. It is music that gives more of itself on each hearing.
it's really the kind of thing you have to hear for yourself and decide from there