http://homepages.bw.edu/~lhartzel/cc/415/415.infosheets/415.tttopics.html Baldwin Wallace College Twelve-Tone Music Topics. http://www.geocities.com/dan_cavanagh/matrix.htm Instructions for the_matrix An interactive matrix builder. http://library.thinkquest.org/27110/noframes/periods/twelvetone.html?tqskip1=1&tqtime=0504 The Music Chamber - The 12-Tone Series Description of the technique with Flash 4 or text demonstration. http://www.geocities.com/al6an6erg/serial.html Twelve-Tone Composition Description of the technique.