Tone: The Author's Attitude
Tone is the author's relationship to the material: ironic, reverent, sardonic, tender, detached. It's heard in word choice, sentence rhythm, and what the narrator chooses to notice. Two writers covering the same subject can produce radically different tones because the tone is not in the subject but in the writer's implicit stance toward it. Tone is what tells the reader how to feel about what they're reading.