 The composers promoted by Belyayev several times wrote musical contributions both in his honor and to contribute to these occasions.For example, in 1886, for his 50th birthday, Rimsky-Korsakov, Borodin, Lyadov and Glazunov collaborated on a string quartet on the notes B-A-F (Be-la-ef), in 1895, Glazunov, Lyadov and Rimsky-Korsakov composed the three movement 'Jour de fête' or 'Name-Day Quartet', and in 1899, 10 of the group collaborated to compose the Variations on a Russian Theme in G major, and another collection -of 16 movements by 11 of the group- was published under the "Les Vendredis" group name.Another of their joint projects was a set of variations on a Russian theme for piano and orchestra, to which in addition Alexander Kopylov, Nikolay Sokolov and other members of the circle contributed individual movements.