The two acts teamed up for a performance of "Black Water" to the surprise and appreciation of the massive audience.

According to sources also covered ("You Never Even Called Me by My Name") and the Outlaws ("Freeborn Man") before telling the audience that Fenway might be "my favorite place that I've ever played."

The band played for nearly three hours, wrapping with an encore that featured "Chicken Fried" a cover of Pink Floyd's "Comfortably Numb" and Charlie Daniels' "Devil Went Down to Georgia."

"All in a night's work for Zac Brown Band, whose combination of easy charisma and expert dishing out of country make even their spikier songs go down smooth."