What society of musicians was founded by Mitrofan Belayev and included Russian composer Natoly Lyadov?
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. He was also the founder of the Belyayev circle, a society of musicians in Russia whose members included Nikolai Rimsky-Korsakov, Alexander Glazunov and Anatoly Lyadov. His surname is often transliterated as "Belaieff" or "Belayev". In 1886 the important Russian painter Ilya Repin made a portrait of Belyayev.
Alexander Spendiaryan Alexander Afanasyevich Spendiaryan (Spendiarov) (Armenian: Ալեքսանդր Ստեփանոսի Սպենդիարյան , Russian: Александр Афанасьевич Спендиаров , November 1, 1871, Kakhovka, Russian Empire – May 7, 1928, Yerevan, Armenia) was an Armenian born in Russia, music composer, conductor, founder of Armenian national symphonic music and one of the patriarchs of Armenian classical music. His compositions include the opera "Almast" (Armenian: Ալմաստ ՝ brilliant) and the "Yerevan Etudes," among others.