He teaches the narrator how to play classical piano and read sheet music (which the narrator rejects at first). Gradually, he becomes an important mentor for the narrator, fostering his interest in a music career and even briefly housing and supporting him after his mother’s death. (The narrator notes that he had one music teacher as a child and then began taking lessons with his church organist, so it is unclear which teacher coordinated his duet with the violinist and took him in after his mother’s death.)