Iconic Sections (2015)
for
alto sax, trumpet, cello and tuba
by
Robert Morris
Program Notes
TEXT
I wrote Iconic Sections to be played at the USF New-Music Festival (March 4-5, 2016) at the University of South Florida at Tampa. The perhaps unconventional instrumentation of alto sax, trumpet, cello, and tuba was determined by which players were available for the performance.
I chose the title "Iconic Sections" to give the piece a mathematical ring. But "Primitive Roots" would have been a better title since the pitch and rhythmic material of the work are based on the primitive root concept in number theory. This idea occurred to me in the late 1970s, since the twelve-tone row of my composition, Not Lilacs (1973), is based on the same concept, but it took me until 2016 to work out the way I could compose with it.
The series for Iconic Sections is a ring or cycle of 36 notes long:
T0: 0BAA1949806813B8571B259720623A374456 0BAA1949806813B8571B259720623A374456 etc. TB: B A 9 9 0 8 3 8 7 B 5 7 0 2 A 7 4 6 0 A 1 4 8 6 1 B 5 1 2 9 2 6 3 3 4 5 etc. TA: A 9 8 8 B 7 2 7 6 A 4 6 B 1 9 6 3 5 etc. T9: 9 8 7 7 A 6 1 6 5 etc. (A = 10 and B = 11 to save space)