Top ten of the most iconic voices in music these past 100 years.
In my opinion:

Frank Sinatra
James Brown
Elvis Presley
Michael Jackson
Aretha Franklin
Whitney Houston
The Bee Gees
Bill Crosby
Bob Marley
Nina Simone

What do you think?

Madonna, Michael Jackson, Britney Spears

Britney
Cher

Mariah Carey the most iconic voice alive™

Miley Cyrus

Not the OP giving actual iconic voices and then the stans running in and saying Britney.

Taylor

GaGa

Aretha and Barry of the Bee Gees are still alive. She is top five among the most iconic voices alive though

Cheryl jk, she barely has a voice

Madonna

I should have known better tbh, it's too much to ask most of the members of this forum to set stanning aside for a second and give objective answers.

Not you missing the best voice ever, aka Mariah Carey

Your other picks are all perfect tho

She's top 15. I think she's has the most iconic voice from the past 25 years but the likes of Ella, Etta James, Tina Turner and even Donna Summer are more memorable and have had more impact vocally than her, let alone the ten music acts I've already mentioned.

Madonna Micheal Jackson Whitney Mariah Elvis Beatles

If you're saying that Britney's voice isn't iconic then you have problems. And no, it's not up to your opinion. If something's iconic, then it's iconic. Britney's voice is. Bye.

+

Stevie Nicks
Freddie Mercury
Janis Joplin
Jim Morrison
Amy Winehouse
Kurt Cobain
Grace Slick
Thom Yorke

etcetera

Brinty & Mariah

no Cher? fail list.