Please answer the following question: Information: - The Pyatnitsky Russian Folk Chorus is a Russian musical group which was established by Mitrofan Pyatnitsky in 1910 initially with 18 peasants from Voronezh, Ryazan and Smolensk gubernias. The peasant chorus held its first performance at the Small hall of the Moscow Nobility Club (later the October Hall of the House of Trade Unions) on March 2, 1911. - Russia (from the Rus'), also officially known as the Russian Federation, is a country in Eurasia. At , Russia is the largest country in the world by surface area, covering more than one-eighth of the Earth's inhabited land area, and the ninth most populous, with over 140million people at the end of March 2016. The European western part of the country is much more populated and urbanised than the eastern, about 77% of the population live in European Russia. Russia's capital Moscow is one of the largest cities in the world, other major urban centers include Saint Petersburg, Novosibirsk, Yekaterinburg, Nizhny Novgorod and Samara. - Mitrofan (Mitrophan) Yefimovich Pyatnitsky ( 21 January 1927) was a Russian and Soviet musician, gatherer of Russian folk songs. He established the famous Pyatnitsky Choir in 1910 from 18 peasants originally from the Voronezh, Ryazan and Smolensk gubernias. After his death, the chorus was named after him. - Mitrofan ( Mitrophan ) Yefimovich Pyatnitsky ( Russian : ) ( 1864 - 1927 ) was a Russian and Soviet musician , gatherer of Russian folk songs . He established the famous Pyatnitsky Choir in 1910 from 18 peasants originally from the Voronezh , Ryazan and Smolensk gubernias . After his death , the chorus was named after him . - Moscow (or ) is the capital and most populous city of Russia, with 12.2 million residents within the city limits and 16.8 million within the urban area. Moscow has the status of a Russian federal city. What is the relationship between 'mitrofan pyatnitsky' and '21 january 1927'?
A:
date of death