“It was not easy to make a list of all my works with their birth dates, instruments I used, titles etc.
This list was made in autumn 1971 but I sincerely fear that in autumn 1972 this same list would be different My opinion on my music is continuously changing.
However, a complete classification even concerning only one day, is always very useful. Moreover, I can say things about my work which will always be true.
My work as a whole is made of several pieces which have no life by themselves.
There pieces are fragments and each work is formed by ten, twelve, a hundred fragments.
Consequently, each work of mine is a suite.”
from the foreword by Giuseppe Chiari