Answer:
Walk on the living, they don't even mumble. Walk on the dead, they mutter and grumble.
My first is a creature whose breeding is unclear. My second, a price you must pay. My whole can be found in the river of Time and refers to events of today.
What is put on a table, cut, but never eaten?
What flies without wings?
Half-way up the hill, I see you at last, lying beneath me with your sounds and sights. A city in the twilight, dim and vast, with smoking roofs, soft bells, and gleaming lights.
What language does a billboard speak?