Russian Folk Music

I seem to have found a kind of a super web resource for Russian folk music last night:

http://www.barynya.com/

Particularly interesting is the section:

http://www.barynya.com/duo/

which has number of cossack songs which are particularly well done available as mp3 downloads, including a really super rendition of the old song about Stenka Raizan's dream (Oy, to ne vyecher...):

http://www.barynya.com/mp3/Stenka%20Razin%60s%20Dream%20.mp3