not sure if software is free, but check out http://arstechnica.com/science/news/2009/09/virtual-composer-makes-beautiful-musicand-stirs-controversy.ars http://a

not sure if software is free, but check out http://arstechnica.com/science/news/2009/09/virtual-composer-makes-beautiful-musicand-stirs-controversy.ars http://arstechnica.com/science/news/2009/09/virtual-composer... it also mentions a book that presumably discusses the algorithms. book: http://mitpress.mit.edu/catalog/item/?ttype=2&tid=10661 http://mitpress.mit.edu/catalog/item/?ttype=2&tid=10661