Coleridge.

As if a lark should suddenly drop dead

While the blue air yet trembled with his song,

So snapped at once that music’s golden thread,

Struck by a nameless fear, that leapt along

From heart to heart, and like a shadow sped

With instantaneous shiver through the throng;

So that some glanced behind, as half aware

A hideous shape of dread were standing there.

As when a crowd of pale men gather round,