Who are the best singers in Rock.?

I'll go with Freddie Mercury-Queen, John Lennon, as of other choices; Robert Plant-Led Zeppelin, Steven Tyler-Aerosmith, Geoff Tate-Queensryche, Axl Rose-Gn'R, Jim Morrison-The Doors, Bruce inson-Iron Maiden, Rob Halford-Judas Priest, Mick Jagger-Rolling Stones....(p.s.-I don't know if all these singers are still in these bands, but they are known for them.)