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This paper addresses the study of leadership in string quartet starting from the analysis of non-verbal behavioral cues. It considers in particular the movement of musicians’ head towards a common point of reference for the ensemble, called the ear, which corresponds to the subjective center of the string quartet. By applying a method based on Granger Causality we investigate whether and how each musician’s distance is influenced by the other musicians. This approach aims at identifying the potential leader (s) by characterizing their greater capacity to influence others’ behavior.