After the early period of writing unabashedly tonal music (1959 – 1964), came a period characterized by a total rejection of tonality (1964 – 1972), of which Canzona for 13 Soloists was the final works. Just as I let several of my tonal scores be consumed by fire, I did the same with a number of scores of this phase. String Quartet nr 1, String Trio, Vigoresque, and Five Preludes for Clarinet and Piano were some of the remaining chamber compositions of this period. It was a fascinating time.
“Music of numbing ferocity and fierce, shrieking dissonances carried by a driving rhythm... Koprowski conducted his own Canzona for Thirteen Soloists, and left the audience stunned by the force of the amplified music, especially the first movement - Tension. Koprowski's demonic appearance as conductor added to the effect, which was changed to one of intense pressure in the second movement - Incessancy, and relived only in the third - Relaxation."