slippery chicken is documented in the form of a manual (the main source of discursive information and examples), source code documentation (for details on individual methods, classes, and functions), and papers.
Papers
Two PDF versions (long and short) of a draft paper are available, however as these are currently under anonymous peer review they're not yet on the web. Please email me for a copy if you are interested.
Michael's article on the history of Algorithmic Composition, written
for the Communications of the ACM, is here.