Korepanov Kamski and Others
(https://sun9-52.userapi.com/impg/ugfD7c-lmLgLbJb8iNNYhsP6_ATgmh7jo8Y0gg/hxD0XWX4W2s.jpg?size=1080x607&quality=96&sign=e0c9aa7b9e1276cbcc816dc73c531e06&type=album)
udmurt music
https://elibrary.unatlib.ru/handle/123456789/16607