Can You Guess Who's in the Hat? 

Hints:

Paul McCartney, John Lennon, Merle Haggard and this artist are the only songwriters who’ve written and recorded more than 20 songs that they’ve also taken to the top of the charts.

“I grew up about thirty miles west of the official part of the Dixie Highway that runs through Georgia.”

He co-wrote several songs on Randy Travis' 1992 album High Lonesome.

Good friends with George Strait and George Jones.