Pearl Jam was jamming out to "W.M.A." during its two-hour headlining set at the Made in America festival Sunday night when Jay-Z sidled on stage to ease into a ripping version of "99 Problems."
Hova organized the two-day festival in Philadelphia -- and headlined Saturday night -- so it wasn't a huge stretch for him to salute the crowd in a Brooklyn Nets ballcap at the end of the weekend. But the culture mash-up was still ultra-surreal. Witness:
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