Evolutionary concepts are being used to support the implementation of higher level information processing devices than could be easily built by human design. We introduce an input device that proved to be appropriate for the study of human perception. The sequence of judgments can be captured to simulate an objective function. The repeated interaction between user and computer allows the user to search hyperspaces of possible solutions without being required to design equations by hand or even understand them. Two musical environments, Vox Populi, an evolutionary composition system, and InstrumentAll, a combined hardware and software musical interface, are briefly described. © 2002 IEEE.1 529534Fogel, D.B., (1999) Evolutionary Computation - Toward A New Philosophy of Machine Intelligence, , 2nd edition, The IEEE PressFoley, J.D., Van Dam, A., Feimer, S.K., Hughes, J.F., (1996) Computer Graphics Principles and Practice, p. 1018. , Addison-Wesley Publishing CompanySims, K., Interactive evolution of equations for procedural models (1993) The Visual Computer, 9 (9), pp. 466-476Sims, K., Evolving three-dimensional morphology and behaviour (1999) Evolutionary Design by Computers, pp. 297-321. , ed. Peter J. Bentley, Morgan KaufmannFogel, L., Evolving art (1992) Proceedings of the First Annual Conference on Evolutionary Programming, pp. 183-189Baluja, S., Pomerleau, D., Jochem, T., Towards automated artificial evolution for computer-generated images (1994) Connection Science, 6 (2-3), pp. 325-354Moroni, A., Manzolli, J., Von Zuben, F., Gudwin, R., Evolutionary computation applied to algorithmic composition (1999) Proceedings of the 1999 Congress on Evolutionary Computation - CEC99, 2, pp. 807-811Moroni, A., Manzolli, J., Von Zuben, F., Gudwin, R., Vox populi: An interactive evolutionary system for algorithmic music composition (2000) The MIT Press: Leonardo Music Journal, 10, pp. 49-54. , CambridgeMoroni, A., Manzolli, J., Von Zuben, F., Gudwin, R., Vox populi: Evolutionary computation for music evolution (2002) Creative Evolutionary Systems, pp. 205-222. , ed. Peter J. Bentley, Morgan KaufmannPronovost, W., Yenkin, L., Anderson, D., Lerner, R., The voice visualizer (1968) Ammerican Annals of the Deaf, 113, pp. 230-238Pellegrino, R., (1993) The Electronic Arts of Sound and Light, , New York: Van NostrandMonro, G., Pressing, J., Sound visualization using embedding: The art and science of auditory autocorrelation (1998) Computer Musical Journal, 22 (2), pp. 20-34Mammana, A.P., Moroni, A., Teixeira, L.A., RitSens -computer aided system for studying rhythmic abilities in bimanual coordination (2001) Conference Abstracts and Applications, SIGGRAPH, p. 256Moroni, A., Manzolli, J., Mammana, A., Instrument all: A virtual instrument (2001) Proceedings of the 4th International Conference Generative ArtDawkins, R., (1986) The Blind Watchmaker, , Harlow, London