Composer Alexey Sumak is a classic of the modern avant-garde music. Sumak's music is performed both in Russia and abroad. Alexey is regularly requested to create symphonic compositions and operas for Theodor Kurenzis, Pavel Kaplevich, the Madrid Opera and Ballet Theater, the Orchestra and Choir of the Stuttgart Radio and Television and Yuri Bashmet. Alexey Sumak wrote the "Oath" for Marimba solo, especially for Peter Glavatskikh. The successful premiere took place in the Great Hall of the Conservatory (Moscow) in May 2018.