Conversation so far:
When was Alexander Vasilyevich Alexandrov born?
Alexander Vasilyevich Alexandrov, known as Sasha, was born on 13 April 1883.
What did Alexander Vasilyevich Alexandrov do in early years?
He travelled to Saint Petersburg to become a chorister at Kazan Cathedral. A pupil of Nikolai Medtner, he studied composition at Saint Petersburg and in Moscow.

Question: What did he write music for?
Self-contained rewrite: What did Alexander Vasilyevich Alexandrov write music for?