The descriptive note comes from item 1713 in :
Diamond, Harold J.
An annotated guide to the literature
New York: Schirmer Books, 1991, 716 p.
This is what Harold J. Diamond had to say:
A study of the structural principles underlying the music, focusing on proportional analyses of isorhythmic and nonisorhythmic works.
© Harold J. Diamond
(c) 2022. Frank Greene. All rights reserved.