Freddie Mercury!

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.

Chris Cornell of Sohndgarden, Temple of the Dog, and Audioslave

I’m also always impressed by Demi Lovato

Serj Tankien

I am a huge Soad fan, but his solo career also counts. The guy has a one in a billion voice, amazing range!

For me, has always been Chris Cornell. Absolutely gutted when he died, knowing I'd never hear anything new from him again.

Hayley Williams of Paramore.

Especially since she started experimenting with solo projects. She's so good and very versatile.

No one mentions Adele?

The chick from paramore

Devin Townsend

I'm always amazed by Robert Plant when I watch old Zeppelin videos

James Maynard, I mean how big are his lungs?

Regina Spektor.

For my money no one can convey as much emotion through their voice as her.

Sara Bareilles

Is incredibly precise. Listening to her voice is like listening to what people are hoping for when they’re autotuning, but she nails it.

Jeff Buckley Ella Fitzgerald Edith Piaf

Tetiana Shmailyuk from Jinjer - a Ukrainian metal band. Her ability to go from her growl to her clean vocals is absolutely wild to me.

Elizabeth Fraser from Cocteau Twins.
Dolores O'Riordan (RIP) from The Cranberries.
Arai Akino, for "VOICES" from Macross Plus.

Hearing Bjork sing “Birthday” on the Sugarcubes’ debut LP was a revelation for me. Still blows me away.

Mike Patton, he has one of the largest vocal octave ranges in music.

https://youtu.be/5Jec7IDvUTM

https://www.ultimate-guitar.com/news/wtf/mike_patton_is_the_greatest_singer_of_all_time_based_on_vocal_range_not_axl_rose_experts_insist.html

Andrea Bocelli and Miley Cyrus.

Floor Jansen

https://youtu.be/4V_eoR6r1Tw

Josh Kiszka of Greta Van Fleet has a hell of a voice.

I'm also surprised that I didn't see anyone mention Mariah Carey.

When Brandi Carlile’s voice cracks and she belts out the chorus near the end of The Story, it’s just incredible. There are better singers, technically, but the pure, raw emotion conveyed is powerful (to me anyway).

Lzzy Hale has an incredible voice

Hailey Williams. Wasn't even into that genre at the time, but her voice always made me think "wow, this is pretty good".

Thom Yorke

Chaka Khan

This Lewis Capaldi dude. He can freaking sing, man.

That's gotta be Antwaun Stanley for me. His work with Vulfpeck and Cory Wong are just phenomenal

Haley Reinhart

The lead singer of the German band, AnnenMayKantereit. (The band name is just three surnames smooshed together.)

Here's my favorite song by them: https://www.youtube.com/watch?v=tERRFWuYG48&t=4 which translates to "barefoot at the piano"

Another great song, a bit more up-beat: https://www.youtube.com/watch?v=y6BmrRLpGJQ&t=3 which translates to "would you go out with me?"

Till Lindemann always gives me the goosebumps.

no mention of bessie smith , billie, nina , janis joplin ?

Ann Wilson (Heart) always makes me smile when I watch her live performances.

Caroline Polachek, Imogen Heap, Charlie Puth, Kim Petras, and occasionally Sia.

Vocal powerhouses.

Floor Jansen and Marcela Bovio, especially when they sing live.

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.

Renée Elise Goldsberry aka Angelica Schuyler in Hamilton

Kristin Chenoweth and Idina Menzel from Wicked

Dimash Qudaibergen. He has the most incredible voice I've ever heard.

https://youtu.be/W29zEuZVaxs

Recently it's this girl. https://youtu.be/YYoP9bxwg84

Her voice is out of this world. Sadly I don't know how to write her name. [Symbol]OK

Linda Perry.

Lead singer of 4 Non Blondes and has a solo career. I don’t even listen to that style of music, but I still get excited when I hear her voice come on.

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.

Since Mike Patton is already on the list:

Eva Cassidy ❤️

https://www.youtube.com/watch?v=2rd8VktT8xY