Answer:
What does no man want, yet no man want to lose?
Held firmly in the hands, like a sword it cuts deep. Bloodless strokes, all, then forward we leap.
I am the heart that does not beat. If cut, I bleed without blood. I can fly, but have no wings. I can float, but have no fins. I can sing, but have no mouth.
What measures out time until in time all is smashed to it?
A kind of weather that comes your way, but add a "D" and it will run away
All about, but cannot be seen, Can be captured, cannot be held, No throat, but can be heard. Who am I?