FRESCO for 4 orchestra groups: Wall-Sounds for Meditation, (1969) [approx. 5 hours length]
In 1969, Stockhausen was asked to present a concert program at the Beethovenhalle in Bonn (birth city of Beethoven). Stockhausen's idea was to do something along the lines of his previous works for independent-but-concurrent compositions, such as ENSEMBLE and MUSIK FÜR EIN HAUS. In this case, 3 rooms in the Beethovenhalle concert complex were used to present 3 simultaneous Stockhausen programs (some with pre-taped works, some performed live). Additionally, four foyer spaces (not normally used for presenting music) contained 4 chamber orchestras, which each independently played a layer of FRESCO ("wall sounds for meditation"), a new "ambient" work, mostly consisting of extremely slow glissandi. Since there were only 3 rehearsals available for this piece before the performance, Stockhausen wrote very technically simple music to play, but the real "magic" of the piece is how the individual players within a group "vibrate" together as they navigate the glissandi (heterophonically). For example, one intention is to create different speeds of frequency beating through close, but contrasting, unison lines.
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!