Conversation so far:
Where did Pierre Boulez begin his musical education in 1943?
In October 1943, he auditioned unsuccessfully for the advanced piano class at the Conservatoire, but he was admitted in January 1944 to the preparatory harmony class of Georges Dandelot.
What was Pierre Boulez's primary focus under Georges Dandelot?
preparatory harmony class
Did Pierre Boulez write any pieces during the time at the Conservatoire?
Did Pierre Boulez receive any special recognition as a student in the preparatory harmony class of Georges Dandelot?
His progress was so rapid that by May 1944, Dandelot's report describes him as the best of the class.

Question: What did he do after winning that award?
Self-contained rewrite: What did Pierre Boulez do after winning the best of the class in Dandelot's report?