Lollapalooza 2015 Lineup: Paul McCartney, Metallica, Florence + the Machine & More

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May 12: James Hetfield of Metallica performs onstage at the 10th annual MusiCares MAP Fund Benefit Concert at Club Nokia in Los Angeles, California.

In today's (March 25) edition of the Chicago Tribune, Lollapalooza revealed its 2015 lineup.

Paul McCartney, Metallica, Florence + the Machine and Sam Smith are headlining the three-day fest in Chicago's Grant Park.

Also on the bill: The Weekend, Bassnectar, A$AP Rocky, Kaskade, Of Monsters & Men, FKA Twigs, TV on the Radio, alt-j, Tyler the Creator, Alabama Shakes, Tove Lo, Brand New, Flying Lotus, Father John Misty, Tame Impala, Charli XCX, Marina & the Diamonds, Kygo, Alesso, Radiohead's Philip Selway and plenty more.

You can check them all out on Lollapalooza.com. Single-day passes to the July 31-Aug. 2 fest go on sale today at 11am ET.