ONCE upon a midnight dreary, while I pondered, weak and weary,
Over many a quaint and curious volume of forgotten lore—
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.”


Ah, distinctly I remember it was in the bleak December,
And each separate dying ember wrought its ghost upon the floor.
Eagerly I wished the morrow;—vainly I had sought to borrow
From my books surcease of sorrow—sorrow for the lost Lenore—
For the rare and radiant maiden whom the angels name Lenore—
Nameless here for evermore.


And the silken sad uncertain rustling of each purple curtain
Thrilled me—filled me with fantastic terrors never felt before;
So that now, to still the beating of my heart, I stood repeating
“ ’Tis some visitor entreating entrance at my chamber door—
Some late visitor entreating entrance at my chamber door;
This it is and nothing more.”


Presently my soul grew stronger; hesitating then no longer,
“Sir,” said I, “or Madam, truly your forgiveness I implore;
But the fact is I was napping, and so gently you came rapping,
And so faintly you came tapping, tapping at my chamber door,
That I scarce was sure I heard you”—here I opened wide the door;—
Darkness there and nothing more.


Deep into that darkness peering, long I stood there wondering, fearing,
Doubting, dreaming dreams no mortals ever dared to dream before;
But the silence was unbroken, and the stillness gave no token,
And the only word there spoken was the whispered word, “Lenore!”
This I whispered, and an echo murmured back the word, “Lenore!”—
Merely this and nothing more.

This poem has many instances of allitiration (where the starting letter of a word get's repeated) and especially assonance (were a vowel in the middle of a word get's repeated multiple times), specifically the /ɔ/ sound get's used a lot.
Repitition is also a common literary device used, with most stanzas containing at least one instance of it.
Furthermore a stylistic figure called consonance get's used in the first stanza, consonance being the use of the same (or simmilar) consonants in close proximity of each other (nodded, napping, suddenly, tapping).
Enumeration (the usage of equel or simmilar concepts) also get's used in the last stanza (wondering, fearing, doubting)