[LAA] Strasheela 0.9.3 has been released

Torsten Anders torsten.anders at plymouth.ac.uk
Tue Apr 1 04:20:31 EDT 2008

Strasheela is a highly expressive constraint-based music composition  
system. Users declaratively state a music theory and the computer  
generates music which complies with this theory. A theory is  
formulated as a constraint satisfaction problem (CSP) by a set of  
rules (constraints) applied to a music representation in which some  
aspects are expressed by variables (unknowns). Music constraint  
programming is style-independent and is well-suited for highly  
complex theories (e.g. a fully-fledged theory of harmony). Results  
can be output into various formats including MIDI, Lilypond, and Csound.

This release adds music theoretical concepts. A generalized version  
of Schoenberg's guidelines on writing good tonal chord progressions  
have been implemented as constraints. Strasheela now facilitates  
composition in 31-tone equal temperament (31 ET). For example,  
various 31 ET chords and scales are provided, and output to Lilypond,  
as well as Csound is supported. 31 ET MIDI output can be defined by  
the user, depending on your MIDI setup. Other additions and bugfixes  
have been made to the system as well.

For more information on Strasheela, please visit

Changes are described at

This release can be downloaded from

Torsten Anders

Torsten Anders
Interdisciplinary Centre for Computer Music Research
University of Plymouth
Office: +44-1752-233667
Private: +44-1752-558917

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