Definition
Mood is often mixed up with tone, but they’re not the same. Tone reflects the speaker's attitude toward the subject — it can be sarcastic, reverent, bitter, or playful. Mood, on the other hand, is all about what the reader experiences. A poem might have a bitter tone but still create a mood of dark comedy. While they interact, they remain distinct.
Poets create mood using all the tools at their disposal: word choice (diction), the sounds of words, the length and rhythm of lines, imagery, setting, and even punctuation. A poem filled with hard consonants and short, choppy lines feels different from one that flows with long, open vowels — even if the subject matter is the same. That shift in feeling is mood.
Why does mood matter? Because it’s what makes a poem memorable. You might forget the specific argument a poem presents, but you’ll remember how it made you feel. Mood is the emotional contract a poem establishes with its reader from the very first line, and the best poems uphold that contract throughout.