Summer's rock fest is here!

Lollapalooza's three-day event kicked off its 20th anniversary bash on Friday at Chicago's Grant Park. The trend-setting music festival was established by Jane's Addiction's Perry Farrell and has been held annually at Grant Park since 2005.

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Big bands headlining Friday included Foster the People and Cults, Muse and Coldplay -- who warmed up the crowd with a surprising performance of Jay-Z's "99 Problems," inspiring thousands to get up and dance.

"All three days are sold out, 90,000 a day," Farrell said to USA Today. "Lollapalooza is such a beautiful, exciting notion now. All our ideas are so much bigger and grander."

To check out the full list of bands, rappers, pop stars, soul singers and DJs -- click here.

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