 the co-perception of color in hearing sounds or music, dates back to Greek antiquity, when philosophers were investigating whether the colour ("chroia", what we now call timbre) of music was a physical quality that could be quantified.The seventeenth-century physicist Isaac Newton tried to solve the problem by assuming that musical tones and colour tones have frequencies in common.The age-old quest for colour-pitch correspondences in order to evoke perceptions of coloured music finally resulted in the construction of color organs and performances of colored music in concert halls at the end of the nineteenth century.