20th Century (1997). Diptych (with refrain) contrasts a lyrical opening movement with a rhythmical and assertive one. A primary grouping for the eight horns favors two groups of four. This is broken by a variety of irregular patterns. Harmonic and articulative differences further expand the underlying approach that generated this work. The opposing statement is heard for a third time - the refrain - as a close. Score & parts. -the composer