Conversation so far:
What role did Alexander Vasilyevich Alexandrov play in the peace concert?
Alexandrov Ensemble was chosen to perform at the concert at Gendarmenmarkt following World War II.
When was the peace concert performed by the Alexandrov Ensemble held?
The Peace Concert was held in 1948.

Question: Who organized the concert?
Self-contained rewrite: Who organized the 1948 Peace Concert?