It is an old Hungarian folk song, reworked for a female choir by 20th-century Hungarian composer József Karai. He's done fantastic work writing dozens of such pieces, and I'm proud to have met him while I was still in college.

If you liked this, you'll like Evening Songs even more. It's a quartet of Transsylvanian songs, very old-style. We're not the one singing on this clip, but we did sing it, and it sounded quite like this:

http://www.youtube.com/watch?v=bUqNjQP0ehQ

The great thing with Karai is that his piano pieces to his choir pieces almost have a life of their own.