Artist Info:  https://www.discogs.com/artist/2962162-Slim-Newton
Other country artists are mentioned in this song at the following times:

(0:10)
Buck Owen
Johnny Cash
Minnie Pearl
(0:15)
Lester & Earl (Lester Flatt and Earl Scruggs)
(0:26)
Merle Haggard
(0:31)
Ferlin Husky
Shirley Jones?
Glen Campbell
(0:40)
Burl Ives
(0:47)
Jean Shepard 
Jeannie C Riley
(0:56)
Kitty Wells 
Bobbie Gentry
Wilf Carter
(1:05)
Lefty Frizzell
(1:17)
Tom And Ted (aka The LeGarde Twins)
(1:29)
Slim Dusty
Chad Morgan
Paul Lester
(1:44)
Shorty Ranger
Reg Lindsay
(1:55)
Rick & Thel Carey
(2:15)
Gordon Parsons
(2:18)
Trevor Day
(2:27)
Buster Noble
(2:33)
Eddie Tapp
(2:35)
Nev Nichols
(2:41)
Kevin King 
(3:03)
Paul Lester