РУССКИЕ НАРОДНЫЕ ПЕСНИ
FAVOURITE RUSSIAN FOLK SONGS
SONG OF STEPAN RAZIN. I. PETROV
AND RAGED THE STORM
Pyatnitsky Russian Folk Choir
DOWN THE VOLGA RIFER. S. LEMESHEV
DOWN THE RIVER
Pyatnitsky Russian Folk Choir
It is very hard to tell (and I myself was doubtful at first) but after comparing the two files/waveforms in my editor, I had concluded that the other recording provided had speed fluctuation (besides the other flaws). I could still be wrong but it would probably be too hard to confirm without another audio sample.