The Zac Brown Band's summer Great American Road Trip tour, which doesn't even kick off until next month, is already gaining plenty of traction.

The band, who have already sold out two shows at Boston's famed Fenway Park, are adding a concert at Chicago's Wrigley Field in September. The 'All Alright' singers will reveal the show's special guests at a later date.

The Great American Road Trip tour will also give fans a chance to meet the group's newest member, bassist Matt Mangano.

“We’re always growing as musicians and challenging ourselves to bring new things to our fans,” lead singer Zac Brown explains.

The ZBB aren't the only country acts to perform at the 41,000 seat venue. Jason Aldean performed at the venue last year, and Blake Shelton will take his Ten Times Crazier tour to the 100-year-old baseball stadium in July.

Tickets for the Chicago show will go on sale on Saturday, June 7. The Great American Road Trip tour -- which includes Kacey Musgraves as the opening act on a few select shows -- kicks off on May 24 in Lincoln, Neb. See a list of all of the upcoming shows here.