The Question and Answer section for Sonny’s Blues is a great resource to ask questions, find answers, and discuss the novel.
Sonny's music is a part of him, and in listening to his brother play.... the narrator begins to understand his pain.
When the narrator hears the revival in the street, he stops and looks out the window to listen. While enjoying the music, he sees Sonny watching the revival outside. When Sonny gets to his apartment, he asks his brother to come and hear him...
Sonny leaves Isabel's home because he doesn't like her mother questioning him when he doesn't show up at school.