Nr. 18: STOP, for Orchestra (as 6 Groups) (1965) [approx. 20 minutes]
Stockhausen composed STOP "on the spot" during a 7-hour composition seminar at the Cologne Courses for New Music 1964-65 (which he had founded in 1963), when the participants asked him to demonstrate "the process of writing a work, with exact details". This piece eventually became a part of Stockhausen's 1973 London Sinfonietta touring group's program (the other pieces being KREUZSPIEL, ZEITMASZE, ADIEU and YLEM, with KONTRA-PUNKTE sometimes substituting for STOP).
STOP is structured so that connected tremolo-based sections alternate with (or are STOPped by) quiet "noise" sections (sparse, un-pitched sounds). The score is written as 42 Sections, each with specific instructions for instrumental layering (tutti vs.smaller combos), dynamics, articulation and available pitches. Different techniques for transitioning from one Section to the next are also indicated, and during most Sections there are brief, fully-scored phrases, played as "solos" by different instruments, which act as a kind of "dotted" through-line melody (at least conceptually).
I feel that it could be useful to have a discussion-forum on the music of Stockhausen. There are so many people from all over the world, young and old, learned and eager to get into contact with this musical world: musicologists, composers, musicians, music lovers; people who plan concerts - who write books or have to give lectures and so on. So there should be much stuff, many ideas that we can share. And when we have open questions, there may be people who studied just that and could give a hint or a stimulus.
A problem might be the English language, but i feel that is the only possibility that many people who are interested can participate. And we can exercise tolerance to mistakes!