Mr James Nugent!
The guitar didn't sound better because it was made better than others of its' type- it sounded good because Glen Campbell was playing it!!!
I've seen Glen's show live here a few years ago, and he was and is a fantastic player.
(Old anecdote, courtesy of country hot guitar picker Marty Stuart. Marty was in a studio in Nashville watching Chet Atkins cut a track. After Chet finished Marty said to him:
'Wow Chet, that Gretsch sounded fantastic!'
Chet looked at him, then pointed at the guitar, now sitting on a guitar stand. Then he said:
'How does it sound now?'..........)
