In my opinion it is an absolute masterpiece, I suggest a video fragment from that era:
http://www.youtube.com/watch?v=9ukk5R6T3TU
here is the album version (ends at 26.25)
http://www.youtube.com/watch?v=DnTONnUBhd0
Great timbral research by Stockhausen, what was he not capable of doing with a tam-tam, objects, various microphones and filters ....to have such creativity today.
