For me it’s Neko Case in any of her bands.
Tetiana Shmailyuk from Jinjer - a Ukrainian metal band. Her ability to go from her growl to her clean vocals is absolutely wild to me.
Holy cow, that’s absolutely wild! There are a handful of female heavy metal vocalists I follow who do a similar things to this and the contrast between clear singing voices and their growls is just something special. Eg. Kasey Karlsen
Not exactly what you’re asking for, but there’s this thing called “shape note singing.”
There’s a long story of why it exists, but people still do it, and even though it has roots in religion, and the songs are religious, the groups you find today never perform in a religious capacity.
Get a buddy and go to one of the meetings. Everybody sits in chairs, in a circle and everybody sings. No instruments, just voices.
It’s a beautiful, eerie sound which always falls flat in recordings.
David Draiman lead vocalist of Disturbed