I move whenever I play/sing. Not much, not flamboyantly, but it helps me keep the beat right. To look at me you might not think that I am moving sometimes, and that is because, being Greek, I am used to dances "driven by the shoulders" - where the West Indians and Latins use their waist as the driver, and Africans their waist and feet, we go into a movement shoulder first. Watch a Tchifteteli dance by any Turk or Arab (or Greek) and you'l see what I mean).

English dances are led by the feet (the arm movements in Morris dancing are embellishments, not "drivers"). And the best example of an English act moving on stage are the Spiers-Boden duo. A joy to behold, and Jon Boden (Scrapy Jon) has even developed his steps to the point where he uses a sound board to dance on and produce a bass-like effect.