monody

noun

1. An ode, as in Greek drama, for a single voice, often specifically a mournful song or dirge.
2. Any poem mourning the death of someone; an elegy.
3. A monotonous or mournful noise.

   “Stroke by stroke, the great familiar monody of that incomparable curfew rose and fell in the stillness.”

4. A composition having a single melodic line.

   “All directions in life were blocked to him. He could not think, he could not sleep, his heart thudded to a deadening monody of fear. Fear that is itself the penalty of all things feared.”