Tentative title is Teaching The Robots To Sing: Creating Algorithmic Music With Ruby. Will include some new material on melodies, some very revised material on harmonies, some music theory (basic theory, jazz theory, and theory based on Detroit techno), plus existing widely-publicized material on lambdas, drum and bass, etc., and just enough probabilistic AI to cause a little mischief.
Not entirely sure what kind of commitment I need from you; all I'm sure of at this point is review of the proposed outline. Presumably, I'll need testers and reviewers for the book itself as well. I won't be able to reply until Sunday - sorry! - but e-mail me if interested.