Orchestral Examples for ACMC 08:
Andrew Sorensen & Andrew Brown
All examples on this page are one shot (i.e. no edits) renderings direct-to-disk. The only human involvement was to stop the rendering process at a certain point.  Each example was rendered directly from Impromptu in real-time and makes use of the Vienna Symphonic Library Special Edition.  You can find the paper that refers to these examples here.
This example demonstrates a rendering where the harmonic system has been heavily constrained to provide a simple diatonic progression.  The rhythm generator was also given a highly constrained syncopations setting.  The confluence of these constraints combined with a simple block homophonic accompaniment has produced a surprisingly dance like work somewhat reminiscent of an 18thC courtly dance.
Examples 2-6 are all renderings made with an identical initial system state based on much freer harmonic and rhythmic constraints.  These examples are provided as a group to help demonstrate the systems strengths and weaknesses.  They are all reasonably long renderings ranging in length from 3-minutes to 10-minutes in duration.  While there is a large variety in the range of thematic material and harmonic movement the overall limitations of a restricted set of accompaniment patterns are easily demonstrated here.  In the authors opinion the examples do demonstrate the surprising success of the simple thematic algorithm generally providing a reasonable balance between novelty and reuse.  Regardless of the thematic differences it is hard to classify these as individual works.  The unnaturalness of the conclusions demonstrates one of the problems relating to large scale form.  At present the system does not have any knowledge about “conclusion” and will render indefinitely.  The unnaturalness of these endings accentuates the forcefully halting of the process through human intervention.
This work has been supported by the Australasian CRC for Interaction  Design (ACID) through the Cooperative Research Centre Program of the Australian Government's Department of Education, Science and Training.
This research relies on aesthetic feedback.  We would love to hear your thoughts on the material. Please email me and let me know what you think!  andrew@moso.com.au