Answer:
I look like a tiny trombone
A hole in a pole. Though I fill a hole in white I'm used more by the day and less by the night
What runs around the whole yard without moving?
I stink in living but when dead smells good.
After you go through a fall, I will take over. All life will stall, or at least grow slower. What am I?
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.