Answer:
What has roots that nobody sees and is taller than trees. Up up up it goes and yet never grows?
I am a rock group with four members. All dead one was assassinated.
A piece of paper that takes most people 3 or 4 years to get.
I am heavy forward, but backward I'm not. What am I?
I am mother and father, but never give birth or nurse. I'm rarely still, but I never wander. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.