Question: The Symphony No. 6 in B minor was first performed in Moscow on 4/16 December, conducted by  Russian pianist, teacher, conductor and composer also known as who?
Sentence (from "Symphony No. 6 (Tchaikovsky)"): The second performance, conducted by Eduard Nápravník, took place 21 days later, at a memorial concert on 6/18 November.
Relevant evidence: No