I have been working on my twelve-tone program (in chuck). 1 - random 12 tones with random note-length for prime. 2 - then retorograde is played. 3 - after that prime and retrograde at the same time (3 times). Here the note-length is a average value.
Britten's twelve-tone 'Screw' theme [4]divides into equivalent tetrachords, each a segment of the circle of fifths: D-A-E-B, F#-C#-G#-D#, Bb-F-C-G. Created by Hyacinth (talk) 03:10, 7 January 2012 (UTC) using Sibelius 5.