Abstract
A ‘‘rational reconstruction’’ of the jazz improvisation system implemented in [David Levitt, ‘‘A Melody Description System for Jazz Improvization,’’ MIT S.M. thesis (1981)] will be discussed. A rational reconstruction is a reimplementation of a computer program in a way which clearly reveals its basic mechanisms and the fundamental issues it addresses. Levitt’s program did melodic improvisation from an initial chord progression, based on a collection of heuristics operating over a simple constraint representation. Its rational reconstruction reveals a number of basic issues in computational aesthetics: The use of constraints to model aesthetic choice; the use of representation to encode stylistic background; and the tension between randomness and structure in creative process.
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