Photo via Zac Brown Band’s Facebook page

Numerous high-profile musicians performed with country/jam crossover stars Zac Brown Band during their Super Sets this weekend. The performances took place at Nashville, TN’s Riverfront Park during Brown’s Southern Ground Music Festival.

On Friday night, fellow country star Alan Jackson kicked off the collaborations by singing both “As She’s Walking Away” and his own “Dixie Highway” with the festival’s headliners. and his own “Dixie Highway” with the festival’s headliners during a mini-acoustic segment that also included an unusual take on Nirvana’s “All Apologies.” Sheryl Crow joined in the festivities for her own “Every Day Is A Winding Road,” and remained onstage as the band continued into Stephen Stills’ “Love The One You’re With.”

Later in the set, John Mayer emerged for his own “Neon,” a song Zac Brown regularly covers. Then, area hero and surprise guest Jerry Douglas joined Mayer and Zac Brown Band for a reading of Bob Dylan’s classic “I Shall Be Released.” Then, Zac Brown Band closed their set with a nod to a Nashville legend Charlie Daniels Band with a cover of “The Devil Went Down To Georgia.”

The collaborations continued during Zac Brown Band’s encore. First, Amos Lee sat in on “The Day I Die,” and then, both Gregg Allman and Mayer took the stage for The Allman Brothers Band’s “Melissa.” Soon after, Sheryl Crow returned to join Allman, Mayer and Zac Brown Band for another song often associated with The Allman Brothers Band, Blind Willie McTell’s “Statesboro Blues.” The night came to a close with Zac Brown Band’s signature song, “Chicken Fried.”

On Saturday, Zac Brown Band played with many of the same guests but the group also shuffled their set list a bit. Mayer rook the stage earlier in the show for “Neon” and “I Shall Be Released” and Zac Brown Band swapped “All Apologies” for Aerosmith’s “Sweet Emotion” during their acoustic segment. For the second night in a row, Crow appeared on “Every Day Is A Winding Road” and “Love The One You’re With” but things took a left turn from there. A little deeper in their set, Zac Brown Band invited out both Mayer and Dwight Yoakam for the latter star’s “Fast As You” and “Guitars, Cadillacs.” As the set progressed, The Duhks’ Sarah Dugas and Amos Lee appeared with Mayer and Zac Brown Band for a cover of Sam Cooke’s “Bring It On Home To Me,” and Lee reprised “The Day I Die” with ZBB.

Gregg Allman returned, as well. This time he led the group through The Allman Brothers Band’s arrangement of “One Way Out” with Mayer on guitar, and his classic “Midnight Rider.” Both Mayer and Crows joined the ensemble for the second set-closing tune. Allman played both “One Way Out” and “Midnight Rider” with Zac Brown Band when he sat in with the group in Camden, NJ earlier this summer.