The treeduck 12 that matter most: 1. Rob Halford 2. Steve Walsh 3. Ronnie James Dio 4. Ian Gillan 5. Freddie Mercury 6. Bruce Dickinson 7. Glenn Hughes 8. David Coverdale 9. Lou Gramm 10. Geoff Tate 11. Joe Lynn Turner 12. David Bowie Great singers who didn't make the cut because they are a bit "reedy" or "raspy" or not quite powerful enough to make it: Brad Delp Robert Plant Paul Stanley Jon Anderson Phil Mogg Steven Tyler Singers who are great in their respective bands but are a bit of an acquired taste for a lot of people, an acquired taste that I obviously acquired very very quickly and easily!! Geddy Lee Ozzy Osbourne Phil Lynott Ian Anderson Good singers who shout a little too much: Roger Daltry Graham Bonnet Special mention: Russell Allen