Wow thanks so much guys, I hope I can get some more insight. I'll check out some of those links.

Bird's Lullaby does sound close, I'll see if I can find a version of that and see if it sounds similar.-it could just be the words that are similar and the melody that's derived from another traditional folk tune.

I do agree, singing has made vast leaps and bounds especially concerning opera. I don't think Aafji had much of an opportunity to train herself as well as other singers due to WW2. She had a lovely voice though and the song is very haunting.