I think we're biased when we make these greatest lists. I didn't bother looking at the list because the person who created this list hasn't heard every live performances of said singer. Instead of listing my personal favorites I'm going to list 3 singers that blew me away when I first heard them. I would probably guess these 3 are not in the list. I'm a hard rock/metal guy at heart but my taste is vast. One minute it's "Sink the Bismark" by Johnny Horton, then "I Saw the Light" by Hank Sr, followed by "Sundown" by Gordon Lightfoot ending with "El Paso" by Marty Robbins and "I'm not a Gentleman" by Geto Boys and everything in between.
Speaking of Marty Robbins. IMO, quite possibly the GOAT singer/songwriter. His storytelling lyrics to the Feleena/jealous Cowboy trilogy are second to none, imo.
Graham Russell from Air Supply. Yes, you heard that right. My wife loves Air Supply. In 2007 I surprised her by taking her to see them for the first time. I was blown away how great he sounded live. 7 days before that show we went to see the so-called Van Halen reunion with Diamond Dave. One singer took really good care of his voice and the other destroyed his. Diamond Dave is my man, but damn
And last but not least. Kenny Rodgers. Another surprise for my wife. I've seen thousands of shows, that Kenny Rodgers show is probably my favorite non-Van Halen show I've ever seen. I have a friend who doesn't look like me or Kenny. Since he only heard of his name, I let him listen to this version of "Lady" and I told him he looked like Kenny to throw him off. After listening to this live version of the song he said, "I can't believe I've never heard of him before." When I told him that Kenny looked like me instead him, he couldn't believe it and realized why he never heard of him. He turned me on the Geto Boys and I turned him onto Kenny Rodgers.
IMO, one of the greatest live performances ever. Kenny had some soul to his voice, that's for sure.