Answer:
Defends your noggin from the hard pavement
It can be used onstage or to express admiration. What is it?
I can be as thin as a picture frame but my insides have many things you can see.
An artΒ-form and its colourful result.
What instrument plays from the heart?
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.