 But some of the concert’s best moments moved beyond homage. Grace Potter, accompanying herself on organ in a beautifully sparse arrangement, made Bob Dylan’s “I Shall Be Released” a pure, lonely hymn. The Kentucky band My Morning Jacket took the stage on its own, keeping the horn section, to kick and stomp its way through “Ophelia.” Mr. Campbell sang the Grateful Dead’s “Tennessee Jed” with John Mayer’s lead guitar teasing all around him. 

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