algorithmic composition

algorithmic composition is the technique of using predetermined rules to create music. the algorithms can be aleatory or totally predetermined, derived from fractals, L-Systems or other statistical models, evolutionary methods (ie mutation/selection processes from genetic algorithms) or a musical grammar could be explored.
it is essentially music which is created using consciously mathematical processes as opposed to a more intuitive 'jamming' state...although most musicians will use algorithms in some form, a guitarist soloing thru a particular scale could be thought of as using aleatory algorithms.
algorithmic composition seems to be a more 'left-brain' approach to composition, i think a 'right-brain' approach would encompass the composer/listener's emotional state as well, this is what i want to try and do with my algorithmic piece, by making it interactive as well as a little bit aleatory. first i would have to create a musical grammar of emotion, a simple start is happy=major key, sad=minor; excited=fast, tired=slow; etc....using polarities so that a slider could be used as a gui. the gui would initialise the piece, which would then run itself through varying possibilities based on the initial inputs.