to an organ-
ically de-
veloping one.
Where none of these
or other goals
is present, si-
lence becomes some-
thing else—not si-
lence at all, but
sounds, the ambi-
ent sounds. The na-
ture of these is
unpredicta-
ble and changing.
These sounds (which are
called silence on-
ly because they
do not form part
of a musi-
cal intention)
may be depen-
ded upon to
exist. The world
teems with them, and
is, in fact, at
no point free of
them. He who has
entered an an-
echoic cham-
ber, a room made
as silent as
technologi-
cally possible,
has heard there two
sounds, one high, one
low—the high the
listener’s ner-
vous system in
operation,
the low his blood
in circul-
ation. There are, dem-
onstrably, sounds
to be heard and
forever, giv-
en ears to hear.
Where these ears are
in connection
with a mind that
has nothing to
do, that mind is
free to enter
into the act
of listening,
hearing each sound
just as it is,
not as a phe-
nomenon more
or less approx-
imating a
preconception.
¶What’s the histo-
ry of the chan-
ges in my com-
position means
with particu-
lar reference
to sounds? I had
in mind when I
chose the sounds for
Construction inMetal that they should be sixteen for each player. The number six- teen was also that of the num- ber of measures of four-four in each unit of the rhythmic struc- ture. In the case of the structure this number was divided four, three, two, three, four; in the case of the materi- als the gamuts of sixteen sounds were divided into four groups of four. The plan, as preconceived, was to use four of the sounds in the first sixteen measures, intro- ducing in each succeeding struc- tural unit four more until the exposi- tion involving all sixteen and lasting through the first four units was completed. The subsequent parts, three, two, three, four, were composed
as develop-
ment of this in-
itial situ-
ation. In ac-
tuality,
this simple plan
was not real-
ized, although it
was only re-
cently that I
became fully
aware that it
was not. I had
known all along
that one of the
players used three
Japanese tem-
ple gongs rather
than four, but the
fact that only
three of these rel-
atively rare
instruments were
then availa-
ble to me, to-
gether with the
attachment I
felt towards their sound,
had convinced me
of the rightness
of this change in
number. More se-
rious, however,
it seems to
me now, was the
effect of beat-
ers: playing cow-
bells first with rub-
ber and then with
metal multi-
plied by two the
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