There was an echo, a low, ominous thrum in the air, as if many feet were slapping against stone all at once.

Yet the music was crackling and bright, grounded by a low thrum.

A low thrum came from the woods behind them.

A low thrum of power came from the ship.

Just as we hit a hundred the car started vibrating, a low thrum that shook my body.

Distinctly Terry heard a low thrum that other patrons were not close enough to notice.

The very sounds here were different, a low, heavy thrum of life.

Crouched in the tree, still running through his options, Chris listened to the low thrum of an approaching automobile.

And she could feel the Power emanating from him, like a low thrum just under the surface of his skin.