Not only have some of these artists sung it, but the Everly Brothers have too and I can't find it on any site about their music and it is upsetting me.... just thought that should be heard, or read.

HI LILI HI LO: The Everly Brothers

A song of love is a sad song
Hi lili, hi lili, hi lo
A song of love is a song of woe,
   don't ask me how I know.
A song of love is a sad song,
but I have loved and ??????.
I sit by my window, and watch the rain.
Hi lili, hi lili, hi lo.
Tomorrow I'll follow the ??????
Hi lili, hi lili, hi lo.

and that is the only version i have ever heard of that song. I have read lyrics, but that is just about it. But for some reason I feel this is still the best version because I love the Everly Brothers' harmony!!!!