Abstract
This paper describes the underlying philosophy and mode of operation of a computerised music-structure generating system. The system's principal object is to enable the user to search for and arrive at structures which are satisfactory for the task in hand, without needing to specify them explicitly. We routinely elicit satisfactory timbres from conventional instruments without a knowledge of the mechanisms which map the physical input to the acoustical output space. The system described attempts to extend this intuitive kind of control to the higher levels of music structure. Essential features of the system are an extremely high degree of constraint on possible output structures, plus real-time operation. The stochastic event-generating algorithm introduces context-free and context-sensitive redundancy into the pitch, rhythmic and other data. The user exercises indirect, overall control via joysticks and graphical displays. The devising of useful mappings between joystick positions and the controlling probability arrays is discussed.
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