“Aquarium or Akvarium (Russian: Аквариум) is a Russian rock group, formed in Leningrad in 1972 by Boris Grebenshchikov (Борис Гребенщиков), then a student of Applied Mathematics at Leningrad State University, and Anatoly (George) Gunitsky, then a playwright and absurdist poet”. – Wikipedia

“Cossacks are a group of predominantly East Slavic people who originally were members of democratic, semi-military communities in Ukraine and Southern Russia. They inhabited sparsely populated areas and islands in the lower Dnieper and Don basins, and played an important role in the historical development of both Ukraine and Russia”. – Wikipedia

Photo: Кубанский казачий хор (Kuban Cossack chorus) - Розпрягайте, хлопцi, коней (Unharness The Horses, Guys!) – Ukrainian