in my experience
The only medium where you can truly see wether a singer has it is LIVE
The singers of the rock/heavy metal scene of the sixties/seventies(Coverdale,Gillan,Hagar)run rings around todays vocally challenged singers
with very few exceptions
Lyrically the weirdest has to be Michael Stipe of REM
Anyone who has a handle on him is obviously not of this planet
Then again a lot of songs are written in a drug induced haze so nobody really knows to be sure,just watch some interviews asking artists to explain the meaning of their songs
cheers
B....OZ