Well, since Darmstadt, I’ve written two pieces: one
in the course of a fifteen minute TV program in Köln.
The other is Music Walk written during two hours in
Stockholm. Neither piece uses chance operations. The
indeterminacy in the case of Music Walk is such that
I cannot predict at all what will happen until we
perform it, David Tudor and I, in Düsseldorf on the
14th. Chance operations are not necessary when the
actions that are made are unknowing. Music Walk
consists of 9 sheets of paper having points and one
without any. A smaller transparent plastic
rectangle having 5 widely spaced parallel lines is
placed over these in any position, bringing some
of the points out of potentiality into activity.
The lines are ambiguous referring to 5 different
categories of sound in any order. Additional
small plastic squares are provided having 5
non-parallel lines which may or may not be used to
make further determinations regarding the nature of
the sounds to be produced. Playing positions are
several: at the keyboard, at the back of the
piano, at a radio. One moves at any time from one
to another of these positions, changing thereby
the reference of the points to the parallel lines.