Answer:
What instrument plays from the heart?
What is part of you and all around you but if it entangles you, it will kill you?
You fill it and it empties, A metaphor for plenty, Depending on what half you see, It's either full or empty
What is found over your head but under your hat?
What has holes on each side, but can still can hold water?
All about, but cannot be seen, Can be captured, cannot be held, No throat, but can be heard. Who am I?