Answer:
I always run but never walk often murmur but never talk have a bed but never sleep has a mouth but never eat.
I can be entertaining until you realize some pieces have been lost.
What has many keys but can't open a single lock?
I make everyone blind. You can't see me but I will always come back for you. 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?
I am a rock group with four members. All dead one was assassinated.