The two brothers watch the singers and this brings them together to discuss what has been on their minds. There are many occurrences where not only blues, but music has brought together characters in Baldwin's stories. Expressing emotions through art has been dated back to as long as art has been alive. Slaves would sing to get them through the long day they were put at work. Pacaso expressed his depression through his art work.
People always find it easier to show how they're feeling rather then to talk about it.
Sonny feels a connection with Charlie Parker rather then with his brother. Charlie Parker speaks to Sonny in a way Sonny's brother never could. The music liberates Sonny from his pain and at the end of the story Sonny's brother realizes his pain and understands it. The music acted as a counselor in a sense to bring the brothers back together again. James Baldwin writing about music as much as he does shows that he too relied on music to verbalize his own emotions.