Neva

I remember I heard about this in a top 10 anime video and I tried finding it but to no avail. It's an anime about a group of songstresses that all live secluded on an island and an evil king wants to use them to conquer the world. I also heard it is quite emotional and the songs are really good. Sorry if the description is a bit too general but it's all I remember. Hope someone knows what I'm talking about.