Jay-Z was the headlining act on day two of the Wireless Festival in London, and he left the crowd with a pleasant suprise. Justin Timberlake joined the rapper on stage for the first live performance of "Holy Grail" from the album, Magna Carta Holy Grail.

The day before, Justin Timberlake invited Jay-Z on stage to perform their smash single "Suit & Tie". It seems like they're getting us ready for Legends of the Summer tour which kicks off this Wednesday.

[via Rolling Stone]

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