Answer:
When it is alive we sing, when it is dead we clap our hands. What is it?
Two horses, swiftest traveling, harnessed in a pair, and grazing ever in places. Distant from them.
Long and slinky like a trout, never sings till it's guts come out.
If you have it, you want to share it. If you share it, you don't have it.
To cross the water I'm the way, for water I'm above. I touch it not and, truth to say, I neither swim nor move.
What never gets any wetter no matter how hard it rains?