Wednesday, March 25, 2015 7:45am ET by  
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Paul McCartney, Metallica and Sam Smith to play Lollapalooza

Sir Paul McCartney and Metallica are among the names confirmed for this year's Lollapalooza.

The two acts will top the bill at the festival, which is taking place at Chicago's Grant Park over July 31-August 2.

Other names confirmed for the event today (March 25) include Sam Smith, Florence + The Machine, Alt-J, A$AP Rocky and Tame Impala.

They're joined by acts such as Alabama Shakes, The Weeknd, FKA Twigs, Nero and Bassnectar.

The likes of Kid Cudi, Brand New, TV on the Radio and Father John Misty are also on the bill.

Weekend tickets for the festival sold out within an hour.

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Watch some of the acts perform live below: