"The Cask of Amontillado"

While searching for an easy part to figure out yester-day, I noticed two small features in "The Cask of Amontillado," specifically in the line "When you're chained in the dark all alone."  "All alone" alliterates, and because there's only one initial sound, there's an illustration of that singularity.  "Alone" is sung with a melisma (Eb C D C Bb), musically giving a sense of degree (for "all").