Answer:
What instrument can make any sound and be heard but not touched or seen?
Timid or weak people are said to not have these.
A sphere has three, a circle has two, and a point has zero. What is it?
The edge of earth and bread.
Often wandering the streets, this group of people cannot afford to be choosers.
Black we are and much admired. Many seek us if they are tired. We tire the horse, and comfort man, and turn White when we've fulfilled your plan.