This one is not likely to be popular here, but I have to be totally honest and say: Miley Cyrus.
Don't get me wrong. I am not really a fan of her or her music (nor am I a hater). But my god does that woman have an incredible voice and a mastery of how to use it.
When Brandi Carlileβs voice cracks and she belts out the chorus near the end of The Story, itβs just incredible. There are better singers, technically, but the pure, raw emotion conveyed is powerful (to me anyway).
Lead singer of 4 Non Blondes and has a solo career. I donβt even listen to that style of music, but I still get excited when I hear her voice come on.
George Michael had an incredible voice and was my singing idol for a long long long time - I'm a contralto so I can't really sing to a lot of female singers unfortunately... His range and timbre... Just amazing.
Nobody will read this, but Kristin Hersh. She was the founder / less singer in Throwing Muses, but her solo work truly amazes me. Literally nobody is like Kristin.
Myles Kennedy. Oh shiiiiiiiiiiiiiiiiiieeeeeeeeeeet, that man can sing...
I've seen him live (with Alter Bridge) a couple of times, and it has just blown me away hearing his live performance be as good as if not better than the studio versions.
There is something captivating about Kate Bush's delivery, she collaborated a lot with Peter Gabriel too who was a fantastic singer with unique delivery as well.
Amber Bain of The Japanese House has a really nice voice.
There's also Caroline Polachek, who I am pretty sure actually has perfect pitch. She is one of the most technically impressive vocalists of her generation IMO.
I'm consistently impressed by the one vocalist from Beast in Black. When I watch their videos and then realize there is one voice in the song and it's that dude, it blows my mind every time.
tldw; a contestant on a European pop idol type show had such perfect pitch and tone, the judges thought she was lip syncing. She wasn't and it's amazing.
Brandi Carlisle is completely wasted on country music. I saw her at a music festival when she was mostly playing rock music and some covers and holy shit she has such effortless range.
Einar Solberg, lead singer of Leprous, has a unique voice. It can sound almost fragile at lower registers, very expressive.... And has incredible range.
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.
I sing in an amateur choir led by a professional singer, and his voice is the purest, warmest, cleanest sound you can imagine. I melt every time he sings a solo or demonstrates part of a song to us.
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.