Lollapalooza 2014 kicked on Friday in Chicago's Grant Park.
Some 100,000 music fans gathered in Grant Park for the first day of Lollapalooza, and brief rain showers didn't stop concert go-ers.
Iggy Azalea, Eminem, Lorde and Arctic Monkeys were the big draws the first day.
Rihanna made a surprise appearance during Eminem's performance. The two sang their hit songs, "Love the way you Lie" and "The Monster."
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