This song represents Scout in many ways, this song has a various amounts of tempos and scales, given the events in Scout's young life I'd say that this song fits her. The song tells you with its harmony the feelings of Scout. This song has a build up of harmony that could be metaphorically related to the maturing of Scout during the events in her young life.
This song purveys the soft side of Scout, the little girl who loves her father and her brother. the girl who is hurt by events and people in her life, but, as Chopin's Nocturne emerges you can feel resolution. Applying this to Scout you can think of the end of the story, as she meets Boo, and the story comes to an end.
This song has a more melodious correlation to the feeling you get during the trial of Tom Robinson, This song reminds me of a African American in the south, because of it's blues melody, and the feeling of a scandalous situation, such as the events during the trial then ends up with many people dead.