Answer:
Something you carry while singing.
What has been around for millions of years but is never more than a month old?
What has 4 fingers and a thumb, but is not living?
A tiny bead, like fragile glass, strung along a cord of grass.
Longer than a decade and shorter than a milennium
I saw the dead bring forth the living. I saw the living bring forth the dead. What did I see?