Derek Smalls?
Just not a lot of low voices in rock music for the same reason all the big female stars are screechers: The demand is for high voices.
You have to go to other genres to get basses. Yes, this is a bit of a hijack, but how often do we talk about bass singers?
Richard Sterban. And man, ain’t no question.
NOBODY sang as low as JD Sumner.
Except perhaps for Thurl Ravenscroft:
Yes, you have heard that voice before. (Tony the Tiger, The Grinch)
This is just for fun … on all sides.
In jazz, it was Billy Eckstine, Mr. X! When it wasn't Herb Jeffries (who also made cowboy movies, Google "The Bronze Buckaroo"!) And finally, my personal favorite, Johnny Hartman: