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e ci—te— d———o——wn———loa—d— Jean Bresson and John MacCallum. Tempo Curving as a Framework or Interactive Computer-Aided Composition. Proceedings of the Sound and Music Computing Conference (SMC). Maynooth, Ireland. 2015. We present computer-aided composition experiments related to the notions of polyrhythmic structures and variable tempo curves. We propose a formal context and some tools that enable the generation of complex polyrhythms with continuously varying tempos integrated in compositional processes and performance, implemented as algorithms and user interfaces.