Kenny Chesney has been added to a jam session at the Zac Brown Band's Southern Ground Music and Food Festival in Nashville, according to an announcement on the festival's website. The festival is set for Sept. 27-28 at Riverfront Park. Chesney will join Jason Mraz as guests during the Zac Brown Band's "super set" on Sept. 27. The lineup for the day includes Grace Potter, the Eli Young Band, Trombone Shorty and the Wood Brothers. John Fogerty will be featured during the Sept. 28 jam. Willie Nelson, Edward Sharpe & the Magnetic Zeros, Dawes, Kacey Musgraves and the Head and the Heart will also perform on Sept. 28.