This site is mainly about the 20th century Russian and Soviet pop song.
First of all, it allows to find different versions of songs
and compare them.
Russian-Record.com - you can listen to phonograph records
Sheet music in the National Library of Russia - you can see file cabinet in Russian, not full documents
Sheet music in the Russian State Library
- you can register and buy scanned sheet music
Rustam Fakhretdinov, firstname.lastname@example.org