After reading the entire story just now, Charlie had no hobbies or interests prior to the surgery and he never listened to music. All he did before the surgery was work and go to the lessons at the adult school. After the surgery, he loved to read and he learned new languages, he also wrote a paper. When he regressed, he went back to work, but was quite withdrawn and he went back to classes until he remembered that he wasn't in them anymore. There is no mention of music.