Zac Brown was the headliner for an All for the Hall show this week in Los Angeles, raising money for the Country Music Hall of Fame and Museum in Nashville. He shared the stage with Emmylou Harris, Vince Gill, Sheryl Crow and Kevin Cronin from REO Speedwagon.

Who was he most psyched to play with?

"Everybody," Zac told cmt.com.

But there might be a favorite after all.

"I wasn't sure that Emmylou Harris was a real person," Zac said. "I wanted to make sure that she wasn't an angel. And I actually put my hand on her back a minute ago to take a picture, so she is a real human being. That was good to know."

When hearing that Zac gushed about her, Emmylou joked, "Oh, it's just because I've been around so long."