Question: What society of musicians was founded by Mitrofan Belayev and included Russian composer Natoly Lyadov?
Sentence (from "Mitrofan Belyayev"): Mitrofan Petrovich Belyayev (Russian: Митрофа́н Петро́вич Беля́ев ; old style 10/22 February 1836, St. Petersburg22 December 1903/ 4 January 1904) was an Imperial Russian music publisher, outstanding philanthropist, and the owner of a large wood dealership enterprise in Russia.
Relevant evidence: No