(not on youtube) Sandy Denny singing Bruton Town, a traditional murder ballad. There's a live solo recording that has appeared on a couple of compilations where she perfectly conveys the tragedy of the final verse. Also one of her own songs
Nothing more, which may or may not be about the writer of the next two songs ...
Linda Thomspson singing
Dimming of the day or
a heart needs a home. Two of the most beautiful songs in the English language, IMO.
Finally, someone a bit less obscure that more than half a dozen people might have heard of
- Kate Bush singing
This woman's work. No explanation required, it simply pierces the soul.