The three-hour special, hosted by reigning CMA Vocal Group of the Year Little Big Town, airs tonight at 8 p.m.
"We were a little shaky and nervous the first year, but now we feel really comfortable, and it's been a blast," one of LBT’s guitarists, Jimi Westbrook, told ABC News. "It's such a cool thing 'cause we're here for the entire thing. We get to see everybody that's here and hang out with them and listen to them play. It's just a great experience."
Other performers include Kenny Chesney, Eric Church, Florida Georgia Line, Dierks Bentley, Brett Eldredge, Sam Hunt, Lady Antebellum, Darius Rucker, Rascal Flatts, Zac Brown Band, Randy Houser, Thomas Rhett, Cole Swindell, Chris Young, Maddie & Tae and Kip Moore.
The performances were filmed during June's four-day CMA Music Festival in Nashville.
"There are a lot of festivals out there. There's a lot of things people can go to, but this is very much about just a love letter to the fans, in my opinion, and saying thank you," said Chesney.