Read this excerpt from "The Raven."

While I nodded, nearly napping, suddenly there came a tapping,
As of some one gently rapping, rapping at my chamber door.
"'Tis some visitor," I muttered, "tapping at my chamber door—
Only this and nothing more."

The rhyme of the words "rapping” and "tapping” in this excerpt help create a mood of

annoyance.
chaos.
urgency.
mystery.