Bare with me on this ( potentially funny thought).. but when, as I am sure many other here,could admit to it, one is playing sometimes it is with such feeling that the expression oft fits the tune!
Historically musicians have thrown themselves into passionate performance by moving in gestures of great expression.. (Lizt was known to wag his long haired head all about when playing, and I have seen film of Horowitz at piano, gurning, just before commencing to play piano.
So admittedly I do my share, but try not look, anyway maybe it cannot be helped and after all shows a real feeling of seriousness in the creative process of expression. And perhaps, if all sat absolutely rigid in expression, or posture; then we would end up with no more than a robotic and mechanical automata, rather than living expressive force in full flow at that moment?
What you all think, or have you any examples of extremes, in performance mannerisms, talk about? Or recall watching?