Answer:
I am the noblest musical instrument
I have a head and a tail but my eyes can never see my tail.
If you look, you cannot see me. And if you see me, you cannot see anything else. I can make anything you want happen, but later everything goes back to normal. What am I?
Crooked as a rainbow and slick as a plate ten thousand horses can't pull me straight.
I have 24 keys but cannot open any locks. Sometimes loud, sometimes soft. 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.