Conversation so far:
What was Billy Corgan's childhood like?
Billy Corgan alleges that his stepmother was physically and emotionally abusive to him.
What sports did Billy Corgan play during childhood?
Billy Corgan, who grew much faster than his fellow students, was a strong athlete in elementary school and was a member of his Marquardt Middle School baseball team.
Was Billy Corgan into music as a child?
Billy Corgan decided to start playing guitar when he went over to a friend's house and saw his friend's Flying V.

Question: What else was he interested in as a child?
Self-contained rewrite: What else was Billy Corgan interested in as a child besides music?