Answer:
Mouth up it gets filled, mouth down it gets empty.
I have a pet, his body is full of coins
What pulls you down and never lets go?
Sitting down you have it, Standing up you don't.
I have a ring, but no hands. I used to be plugged into the wall but now I follow you every where. What am I?
I am a rock group with four members. All dead one was assassinated.