I've saved a few traditional russian themes from an old Tetris game and would like to know the originals behind these arrangements. I tried to find them but I'm completely clueless when it comes to russian music, so if you recognise any of them, please let me know! :)

Song #1
(https://dl.dropboxusercontent.com/u/2495109/rus1.mp3)
Song #2
(https://dl.dropboxusercontent.com/u/2495109/rus2.mp3)
Song #3
(https://dl.dropboxusercontent.com/u/2495109/rus3.mp3)
Song #4
(https://dl.dropboxusercontent.com/u/2495109/rus4.mp3)
Song #5
(https://dl.dropboxusercontent.com/u/2495109/rus5.mp3)
Song #6
(https://dl.dropboxusercontent.com/u/2495109/rus6.mp3)
Song #7
(https://dl.dropboxusercontent.com/u/2495109/rus7.mp3)

Which version of Tetris are these from?

Most Tetris songs I know of are Russian folk songs. While I don't know any of these, A good place to start would be:
https://en.wikipedia.org/wiki/Category:Russian_folk_songs