The“First Concert for Orchestra” is grouped into three movements: Allegretto,Allegro, Mosso non troppo, of which the second is a “Scherzo”.

Theorchestra is made up as Mozart's instrumentation plus a piano, an English hornand a trombone. There are no essential differences in style as compared withthe last work, “Diagramma Circolare”, e.g. the structure is basicallycounterpoint, but not rigidly following 12-tone practice although worked by andlarge according to it, for which reason the impression is extensively atonal.