Answer:
What can you add to a bucket full of water to make it lighter?
What is Mozart doing right now?
What has many keys, but can't even open a single door?
What kind of sandwich sinks to the bottom of the tub?
Has a tongue, but never talks. Has no legs, but sometimes walks.
Thousands lay up gold within this house. But no man made it. Spears past counting guard this house, but no man wards it.