As a festival, Bonnaroo has come to be defined by its diversity – Malian worldbeat duo Amadou and Mariam, bookish indie stars Grizzly Bear and hip-hop legends the Wu-Tang Clan performed within hours of each other on Friday. But the main-stage headliner always plays unopposed, the idea being that the entire Bonnaroo community can coalesce around a single artist. Across cultural, generational and aesthetic lines, whose catalogue could possibly be more universal than McCartney's? The answer: Nobody's. And that made this the single greatest Bonnaroo headlining performance in the festival's 12-year history, as it was moment after awesome moment of fever-pitched collective transcendence. "Paperback Writer," "Maybe I'm Amazed," "Band on the Run," "Blackbird," "Something" (played in tribute to George Harrison), "Eleanor Rigby," "We Can Work It Out," "Hey Jude" – to have not gotten swept up in and invigorated by the life-affirming celebration would be an outright rejection of joy.