Matt Shultz, of Cage The Elephant, performs at Lollapalooza in Grant Park on Sunday, Aug. 3, 2014. | Ashlee Rezin/Sun-Times

Matt Shultz, of Cage The Elephant, performs at Lollapalooza in Grant Park on Sunday, Aug. 3, 2014. | Ashlee Rezin/Sun-Times

 Jacob Tilley, of Young The Giant, performs at the Riviera Theater in Chicago on Thursday, Feb. 23, 2012. | Ashlee Rezin/for Time Out Chicago

Jacob Tilley, of Young The Giant, performs at the Riviera Theater in Chicago on Thursday, Feb. 23, 2012. | Ashlee Rezin/for Time Out Chicago

 Florence Welch, of Florence and the Machine, performs on day three of Lollapalooza in Grant Park on Sunday, Aug. 2, 2015. | Ashlee Rezin/Sun-Times

Florence Welch, of Florence and the Machine, performs on day three of Lollapalooza in Grant Park on Sunday, Aug. 2, 2015. | Ashlee Rezin/Sun-Times

 Festival-goers dance during Tiesto's performance on day three of the Spring Awakening Music Festival at Soldier Field on Sunday, June 14, 2015. | Ashlee Rezin/for Sun-Times Network

Festival-goers dance during Tiesto's performance on day three of the Spring Awakening Music Festival at Soldier Field on Sunday, June 14, 2015. | Ashlee Rezin/for Sun-Times Network

 Eminem performs at Lollapalooza in Grant Park on Friday, Aug. 1, 2014. | Ashlee Rezin/Sun-Times

Eminem performs at Lollapalooza in Grant Park on Friday, Aug. 1, 2014. | Ashlee Rezin/Sun-Times

 Andrew W. K. performs at the Riviera Theatre in Chicago on Sunday, March 25, 2012. | Ashlee Rezin/for Time Out Chicago

Andrew W. K. performs at the Riviera Theatre in Chicago on Sunday, March 25, 2012. | Ashlee Rezin/for Time Out Chicago

 Jimmy Cliff performs on day three of Riot Fest in Douglas Park on Sunday, Sept. 13, 2015. | Ashlee Rezin/Sun-Times  

Jimmy Cliff performs on day three of Riot Fest in Douglas Park on Sunday, Sept. 13, 2015. | Ashlee Rezin/Sun-Times  

 Three 6 Mafia performs at Metro in Chicago on Thursday, June 28, 2012. | Ashlee Rezin/for Time Out Chicago

Three 6 Mafia performs at Metro in Chicago on Thursday, June 28, 2012. | Ashlee Rezin/for Time Out Chicago

 Attendees dance during Audien's performance on day three of the Spring Awakening Music Festival at Soldier Field on Sunday, June 14, 2015. | Ashlee Rezin/for Sun-Times Network

Attendees dance during Audien's performance on day three of the Spring Awakening Music Festival at Soldier Field on Sunday, June 14, 2015. | Ashlee Rezin/for Sun-Times Network

 Justin Hawkins, of The Darkness, performs at the Vic Theatre in Chicago on Sunday, Jan. 27, 2013. | Ashlee Rezin/for Time Out Chicago

Justin Hawkins, of The Darkness, performs at the Vic Theatre in Chicago on Sunday, Jan. 27, 2013. | Ashlee Rezin/for Time Out Chicago

 Festival-goers cheer as Gwar performs on day two of Riot Fest in Douglas Park on Saturday, Sept. 12, 2015. | Ashlee Rezin/Sun-Times

Festival-goers cheer as Gwar performs on day two of Riot Fest in Douglas Park on Saturday, Sept. 12, 2015. | Ashlee Rezin/Sun-Times

 Snoop Dogg performs on day three of Riot Fest in Douglas Park on Sunday, Sept. 13, 2015. | Ashlee Rezin/Sun-Times

Snoop Dogg performs on day three of Riot Fest in Douglas Park on Sunday, Sept. 13, 2015. | Ashlee Rezin/Sun-Times