U2 did its first US festival set ever at Bonaroo on Friday night (6/9). During it, Bono paused before the band did One Tree Hill to say, 'This next song is about a friend of ours that was stolen away from us far too soon, way back then. And I’m sure a lot of people here at Bonnaroo have had a similar experience. Tonight, we want to sing it for Lily Cornell. Her dad had an epic heart.'

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