They are not just including rock, FWIW. I can’t get to all of the names as my connection is spotty.
Some names I would include if they aren’t there (there really are a lot of great popular singers from the last century...) in a longer list of people I love to listen to:
Levi Stubbs
Karen Carpenter
Doris Day
Clyde McPhatter
Mel Carter
Brook Benton
My favorites:
Male, Frank Sinatra
Female, Karen Carpenter (gone too soon)
Of course there are many, many more
Nat King Cole
Linda Ronstadt
…….