Answer:
Come up and we go, Go down and we stay.
Securing your documents is easy with these trusty metal objects
Tickle with your fingers and a song it will sing. Be careful, though, you may break a string. What is it?
What does a stone become when in the water?
No matter how little or how much you use me, you change me every month. What am I?
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.