When Larry Gatlin first moved to Nashville, in 1971, he was fresh off a job waiting tables at a Steak and Ale outside Houston, a young unknown songwriter thrilled just be in the presence of heroes like Roger Miller, Mickey Newbury, and Willie Nelson. But as big as his dreams were, his clear, rich tenor voice was even bigger. Barely a year and a half later, he found himself in Atlantic Studios, in New York, enlisted to sing backup for Willie in the sessions that produced the game-changing 1973 album Shotgun Willie.(Read a transcript of this episode below.)This week on One by Willie, Gatlin, now known for classic hits like “All the Gold in California” and “Broken Lady” and a member of the Nashville Songwriters Hall…