Answer:
Beautiful girls strut and sexy men 'do their little turn' on this.
It's equally comfortable in an orchestra and a geometry textbook. What is it?
Always old, sometimes new. Never sad, sometimes blue. Never empty, sometimes full. Never pushes, always pulls.
They try to beat me, they try in vain. And when I win, I end the pain.
I have it, I donβt share it. If I share it, I donβt have it. What is it?
What sphinxes employ and players enjoy.