This site is mainly about the 20th century Russian and Soviet pop song.
First of all, it allows you to find print versions of a song
(and compare them) or mention of print versions.
Russian-Record.com - to listen to phonograph records
Sheet music in the National Library of Russia - file cabinet only
Sheet music in the Russian State Library
- you can register and order scanned sheet music
Rustam Fakhretdinov, firstname.lastname@example.org