This article presents preliminary quantitative results from movement analysis of several clarinet performers with respect to nonobvious or ancillary gestures produced while playing a piece. The comparison of various performances of a piece by the same clarinetist shows a high consistency of movement patterns. Different clarinetists show different overall patterns, although clear similarities may be found, suggesting the existence of various levels of information in the resulting movement. The relationship of these non-obvious gestures to material/physiological, structural andin terpretative parameters is highlighted.