One of the reasons artists like Ani DiFranco call Bonnaroo the "coolest" music festival in America and makes acts like Santigold rave about the fest and its crowd -- from the stage, no less -- is the diversity of its acts and the enthusiasm of the fans to hear all of it.

Case in point: the Rev. Al Green, who performed a slew of classics along with material from his latest, 'Lay It Down' on Friday afternoon. And indeed, the Reverend did lay it down as he preached the gospel of rock 'n' roll to a sea of people tens of thousands strong from the main stage.

Tossing red roses to the audience and telling them he wished he could get down there to dance with them, Green led his band through a slew of old-time classics including 'My Girl,' '(Sittin' on) The Dock of the Bay' and 'I Can't Help Myself (Sugar Pie Honey Bunch).' The soul legend told the crowd that the songs were intended "to make you know where we came from... When the music was good, the loving was good, and everything was good."

Of course, that also describes Bonnaroo. We've got 80,000 witnesses. Can we get an "Amen"?