Sonny always used music as a way to escape. It is the only thing that gave him hope and kept him dreaming for a better life. His music inspired him and gave him hope for the future. His brother had the role of a teacher to his brother and always felt a need to protect him, I think, but he realized he couldn't do that, that Sonny had to make his own way. When he went to see Sonny at the club at the end of the story, he saw why Sonny loved his music so much.