There are a number of folks around who know and play this tune--as it has been part of the International Folkdance repertoire for a long time, but as far as I can find, no one has put it up on line(check variant spellings, because it is a Bulgarian word with no official Latin letter spelling)--only thing is, I am not familiar with the Kornog recording(for that matter, it's been a long time since I've heard the tune, and can't quite bring it to mind) so I am not sure how much like the Bulgarian recordings it is--at any rate, I doubt that it has been commercially published, but there are undoubtably lots of scratch sheets of it around--I may even have it, though I have to look for some long neglected music folders--as I said, even still, it might not give you what you want.

I can tell you how to play a rechinitza--it has a pulse that is "quick quick slow" counted 1-2 1-2-1-2-3--on a plectrum instrument, "down up down up down up down"--the helpful thing to know is that the melody tends to simply be sixteenth notes that run in phrases that match the pulse--well, it ain't the same as a lesson, but it might help--