Conversation so far:
What did Alan Menken do after he graduated college?
After graduating, Menken's plan was to become either a rock star or a recording artist.
Did Alan Menken follow the plan to become either a rock star or a recording artist?
His interest in writing musicals increased when he joined the Broadcast Music, Inc. (BMI) Musical Theatre Workshop and was mentored by Lehman Engel.

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