by Anitra Pavlico
In a recent study, data scientists based in Japan found that classical music over the past several centuries has followed laws of evolution. How can non-living cultural expression adhere to these rules?
Evolution is an “algorithmic process applied to populations of individuals.” [1] Individuals vary, and certain individuals’ traits are passed on while others are culled. These steps are repeated many times. In biology, scientists can study the gene as a “unit of inheritance,” but an analogous unit of inheritance has to be selected in a study of a cultural practice. Eita Nakamura at Kyoto University and Kunihiko Kaneko at the University of Tokyo decided to look at unique musical features such as the tritone–a dissonant interval of three whole notes–and measure the number of occurrences in Western musical compositions over the centuries.
According to Nakamura and Kaneko, “The mean and standard deviation of the frequency (probability) of tritones steadily increased during the years 1500-1900.” Because this might have been just a function of individual composers’ preferences or “social communities” and not necessarily governed by statistical evolutionary laws, they developed a mathematical model of evolution to tell the difference. The tritone is a relatively rare musical event, but its use has spread over the centuries in a way that the study’s authors say follow precise statistical rules. [2] Read more »