Answer:
Goes over all the hills and hollows. Bites hard, but never swallows.
Beautiful girls strut and sexy men 'do their little turn' on this.
All about, but cannot be seen, Can be captured, cannot be held, No throat, but can be heard. Who am I?
Take one out and scratch my head I am now black but once was red.
Being able to interpret the letters on this screen proves that you have this quality.
What covers its face with its hands, speaks no language, yet most known what it's saying?