Twenty years ago I heard this tune on the radio. It was a live performance and I think there was only a flute and a piano.I accidentally recorded it and played the tape until the tape wore out.
I've heard a number of versions with some significant deviations.
Jay Ungar plays it on violin on his Lover's Waltz album and I like Jay Ungar but I think he makes it sound too sweet.
When done simple and raw with good musicians, this tune can make you break out into a sweat.
I'm fascinated by it, if not obsessed.