Noora Louhimo - the lead singer of battle beast and Emelie Autumn

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.

Bruno Mars

Juliana Chahayed

Judith Durham of th Aussie folk group The Seekers

花たん (Hanatan) has an absolutely amazing vocal range https://www.youtube.com/watch?v=owNScNjLR8g

senya https://www.youtube.com/watch?v=NpgaGhAW9So

Jonny Craig man, my absolute favourite singer. I feel like he's great in early DGD but he peaks in Emarosa, specifically on the album Relativity.

Tatsuro Yamashita was pretty impressive for several reasons: great singer/songwriter (he has some really solid range) and producer, S tier in singing English phonetically, and he's good in Japanese, too.

Celine Dion, Adele, or Andrea Bocelli for sure

Halsey Ellie Goulding Khalid