Answer:
Each of these ends in a kettle full of precious metal and the double variety is quite awesome
Thirty white horses on a red hill, first they champ, then they stamp, then they stand still.
I bind it and it walks. I loose it and it stops.
Walk on the living, they don't even mumble. Walk on the dead, they mutter and grumble.
What begins and has no end? What is the ending of all that begins?
If it’s information you seek, come and see me. If it’s pairs of letters you need, I have consecutively three. What am I?