For some reason Ms Amos doesn't get to me. All a matter of taste, I suppose. Someone who is getting to me more and more these days is Kate Bush, and I think she fits your topic title equally well. Just an observation. :=)
Tori is definitely not everyone's cup of tea. And this album is particular touches on Celtic mythology, includes chamber music, has a story line to follow, etc. But for fans, it's one of her best works. Her projects don't always work, but I'm so pleased she continues to explore new ideas after almost 20 years of making albums.
I do know that she and a lot of her fans get sick of the Kate Bush comparisons. :-)