I'm looking for songs that are particularly emotional/passionate, by female vocalists in the mezzo-soprano/soprano range, about a doomed relationship or one that didn't fully come to fruition. The longer the song is the better, bonus points if it gradually builds towards a peak. Even if not explicitly about a romantic relationship, if it's ambiguous enough to be interpreted as such I'll take it (Troy by Sinead O'Connor for example)
Examples:
Björk - Notget
Joan Baez - Diamonds & Rust
Tori Amos - A Sorta Fairytale
(I'm not fully familiar with the discographies of the aforementioned artists so feel free to suggest any songs by them that fit the description)