Bonnaroo is known for its collaborative spirit. When artists arrive at the festival, its understood that sit ins and jam sessions are not only suggested, they are expected. Sometimes the artists just want to keep playing when their sets are over, in backstage situations that, with so many artists from all walks of life on The Farm, can be once-in-a-lifetime.That’s just what happened this Sunday, when Ween and Father John Misty played back-to-back sets to close out the Which Stage. While Dead & Company played their epic two-set finale on the What Stage, Dean Ween and Father John Misty jammed out in Ween’s dressing room. Ween plays bass, and Father John plays drums, a throwback to his days in Fleet Foxes. With Kurt Vile and others looking on in the background, it’s awesome to see these musicians playing for the joy of playing.See below for a video of this rare performance!