Several algorithms for finding the tonal center of a musical context are extant in the literature. For use in interactive music systems, we are interested in those which are fast enough to run in real time and that need only make reference to the material as it appears in sequence. In this paper I will examine a number of such algorithms and the ways in which their contribution to real-time algorithmic listening can be bolstered by reference to concurrent analyzers working on other tasks.

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... as part of the discussion I will review my own key finder, the focus here is on the coordination of published methods using control structures for multi-process analysis and their application in performance.