A man holds a baby wearing ear protection during a performance at the Lollapalooza in Chicago's Grant Park on Friday, Aug. 1, 2014. (Steve C. Mitchell/Invision/AP)
Lorde performs at Lollapalooza in Chicago's Grant Park on Friday, Aug. 1, 2014. (Steve C. Mitchell/Invision/AP)
Eminem performs at Lollapalooza in Chicago's Grant Park on Friday, Aug. 1, 2014. (Steve C Mitchell/Invision/AP)
Nas performs at Lollapalooza in Chicago's Grant Park on Saturday, Aug. 2, 2014. (Steve C Mitchell/Invision/AP)
Andre 3000 (L) and Big Boi (R) of Outkast perform at Lollapalooza in Chicago's Grant Park on Saturday, Aug. 2, 2014. (Steve C Mitchell/Invision/AP)
Matt Shultz of Cage The Elephant performs at Lollapalooza in Chicago's Grant Park on Sunday, Aug. 3, 2014. (Steve C. Mitchell/Invision/AP)
Caleb Followill of Kings of Leon performs at Lollapalooza in Chicago's Grant Park on Sunday, Aug. 3, 2014. (Steve C. Mitchell/Invision/AP)