Way too many to list, but I'll certainly concur with those who listed my favorite hard rock singer, Chris Cornell.
I might also add Nick Cave and David Bowie...
Favorite rock/pop male voices
Favorite rock/pop male voices
Emmit Rhodes
Ian Anderson (Jethro Tull)
Rod Stewart
Ian Gillan (Deep Purple)
James Taylor
Justin Hayward (Moody Blues)
Eric Woolfson (Alan Parsons)
Don Henley (Eagles)
Would appreciate your input so I can expand my horizons…