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from Heartstone II: Prase
Heartstone was completed in 1992 and extensively revised in 2007. The score was composed with a Lisp-based expert-system. This system enabled relationships between musical parameters, difficult if not impossible to make with conventional means, to be explored and new material generated. For example, in the score of Heartstone the concept of extended tonality is a recurring feature in the compositional argument.
The notion of traditional associations between stone, earth and direction found in Chinese music formed the backdrop for imaginary journeys with new tonality schemes derived from melodic, rhythmic, and dynamic material. Algorithmically-structured tonality counterpoint was achieved between different instrumental parts (see Movement 3) and tonalities were made to modulate with one another, just as a sine wave might modulate another wave form on an analogue synthesiser.

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Nigel Morgan, Prudential Buildings, 55 Westgate, Wakefield, West Yorkshire, WF1 1BW, United Kingdom Tel: 01924 383017 e-mail: tonalitysystems@mac.com

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