Strashella (Automatic counter point software)

http://strasheela.sourceforge.net/strasheela/doc/index.html#sec3

Consecutive Semitone Contraint

http://music.princeton.edu/~dmitri/consecutivesemitone.pdf

George Perle: Pitch Class Set Analysis an Evaluation

http://www.jstor.org/pss/763567

Uniform Layout Keyboard

http://daskin.com/index.html

Realtime Constraint Programming

http://strasheela.sourceforge.net/strasheela/doc/Example-Realtime-SimpleCounterpoint.html

Creating Stand Alone SuperCollider Applications

http://akustik.hfbk.net/sc/SuperColliderHelp/Other%20Topics/Creating-Standalone-Applications.html

SuperCollider Quark: PitchCircle

http://quarks.svn.sourceforge.net/viewvc/quarks/PitchCircle/