Answer:
You heard me before and then again. Afterward I die until you call me again.
I start new then become old. Start clean but become dirty. I usually start big then become little. What am I?
My voice is tender, my waist is slender and I'm often invited to play. Yet wherever I go, I must take my bow or else I have nothing to say. What am I?
I run around the city but I never move.
I wear a red robe with staff in hand and a stone in my throat.
They're actually great swimmers now, but later they will become excellent hoppers.