The Raven" is the most famous of Poe's poems, notable for its melodic and dramatic qualities. The meter of the poem is mostly trochaic octameter, with eight stressed-unstressed two-syllable feet per lines. Combined with the predominating ABCBBB end rhyme scheme and the frequent use of internal rhyme, the trochaic octameter and the refrain of "nothing more" and "nevermore" give the poem a musical lilt when read aloud. Poe also emphasizes the "O" sound in words such as "Lenore" and "nevermore" in order to underline the melancholy and lonely sound of the poem and to establish the overall atmosphere. Finally, the repetition of "nevermore" gives a circular sense to the poem and contributes to what Poe termed the unity of effect, where each word and line adds to the larger meaning of the poem.