Singer:Freddy Mercury(Queen) or Geddy Lee(Rush) Growling Vocalist: Mikael Akerfeldt(Opeth) or Tommie Rodgers(BTBAM)
The first two because those two bands were a couple of my first real rock bands that i listened too. The second two because Akerfeldt's death metal growl is incredibly evil and just astounding. And Tommie's vocalizing expands over a lot of types...i can't even describe half of them. This epitomizes his talent.(guy on left)
Thom Yorke (Radiohead) is one my favorite vocalists for his beautiful range, and Glenn Danzig (Misfits) is my other favorite because of his theatrical baritone.
There is no competing with Freddy Mercury. He was the most talented rock lead singer ever to live. And, he played for one of the best bands to exist too (Queen)