Concurrence

Abstract
This article describes the automated techniques employed by the author to create Concurrence for solo violin. The work is based on principles drawn from Gestalt psychology; it is comprised of three streams "between which the music alternates much in the same way as a novel or film might alternate between scenesÓ. Furthermore, each stream undertakes its own independent evolution. Differences between streams and between states of individual streams are brought about tonally by contrasting statistical emphases among the twelve chromatic degrees and rhythmically by contrasts between characteristic patterns associated with each state. The compilation of a thesaurus detailing gradations of similarity between patterns and the representation of the musical form as a structural network facilitate selection of rhythmic material which is appropriate to the form. Remarks on implementation describe new refinements in the author's technique of statistical feedback. The article closes with comments on the interplay between artificial intelligence and human creativity in automated composition.