Conversation so far:
What did Alan Menken do after Alan Menken graduated?
After graduating, Menken's plan was to become either a rock star or a recording artist.
Did he follow that plan?
His interest in writing musicals increased when he joined the Broadcast Music, Inc.

Question: What did he do when he joined BMI?
Self-contained rewrite: What did Menken do when he joined the BMI?