Something about this song reminds me of Portuguese Fado. Two of the most fantastic voices to ever visit us here on Earth - Amalia Rodrigues, and Sandy Denny!
There are a few female voices that seem to channel something directly from the subconscious and make it manifest - Aretha Franklin, Janis Joplin, Chrissy Hynde, Elizabeth Frazer and, of course Sandy Denny. All very different but emotional, moving.