This was written for a concert (Chance Meeting) in the Metzgasse, Winterthur, with students of the conservatory. The concert was built round a new version of Piece of 4 for flute, alto flute, clarinet, and piano. Other works performed were:

The proportions in the piece are derived from Michael Harlow’s *Stonepoem*—the use of my Abelian Form is described in the score as follows:

Introduction from the score

The tape uses only stone sounds. I took the sound material to Moritz Wetter, a student who had been in the group Brigitte and I took to London. He had just established his own studio and within about 5 hours he had put the work together according to my instructions. The tape is not Ablelian, but has 7 clear sections corresponding to the seven larger sections (arabic numbers in the score). This tape pleased me so much I also let it be played solo in Paris: at a concert at the UPIC course which I attended in 1987.