Jay-Z and Justin Timberlake Perform 'Holy Grail' at Wireless Festival

New song gets its live debut just as Jay-Z scores his first UK Number One

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Jay-Z closed out Day Two of the Wireless Festival by treating the London crowd to the first live performance of his new track "Holy Grail" on Saturday night, bringing out Justin Timberlake to help on the vocals. Jay-Z had joined Timberlake the previous night onstage for "Suit and Tie" during Timberlake's headlining set, and the two performed a full set together on Sunday night for the festival's finale. They'll be heading out on their "Legends of the Summer" tour this week, kicking things off in Toronto.

Summer Tour Preview 2013: Jay-Z and Justin Timberlake

Jay-Z made "Holy Grail" available for streaming last week just after his new album, Magna Carta Holy Grail, came out in a limited release to Samsung Galaxy users. The album is now in general release, and has brought Jay-Z to the top of the U.K. charts for the first time, according to Reuters.