If I were a Dead Russian Composer, I would be Nikolai Rimsky-Korsakov.
Considered the leader of the 19th Century Composer group "The Mighty Handful," I am indeed the teacher among them. My orchestration skills are superbly colorful, and are explained in my book on the topic, but works like "Scheherezade" explain my mastery better.
Who would you be? Dead Russian Composer Personality Test
Funny I've never even heard of the guy.