Outside Landers got a special treat on Sunday afternoon when Arcade Fire frontman Win Butler joined blues legend Mavis Staples onstage for a surprise cover of "The Weight," the 1968 rock and roll hit by The Band.
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The already cheering crowd went wild, yelling, "Yeah, Win!" when Butler stepped onto the stage holding an acoustic guitar. Staples wailed through the vocals with her deep signature howl, but Butler took the mic for one verse, much to the crowd's delight.
Butler performed later in the evening with Arcade Fire as the headliner for the evening.
Check out Staples and Butler's performance in our video below: