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

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

 Metallica lead singer and guitarist James Hetfield performs at Soldier Field, Sunday, June 18, 2017. | Ashlee Rezin/Sun-Times

Metallica lead singer and guitarist James Hetfield performs at Soldier Field, Sunday, June 18, 2017. | Ashlee Rezin/Sun-Times

 A Marshmello fan dances on day one of the Spring Awakening Music Festival at Addams/Medill Park, Friday, June 9, 2017. | Ashlee Rezin/Sun-Times

A Marshmello fan dances on day one of the Spring Awakening Music Festival at Addams/Medill Park, Friday, June 9, 2017. | Ashlee Rezin/Sun-Times

 Vic Mensa performs on day one of Riot Fest in Douglas Park, Friday, Sept. 15, 2017. | Ashlee Rezin/Sun-Times  

Vic Mensa performs on day one of Riot Fest in Douglas Park, Friday, Sept. 15, 2017. | Ashlee Rezin/Sun-Times  

 Andrew McMahon in the Wilderness performs on day two of Lollapalooza in Grant Park, Friday, Aug. 4, 2017. | Ashlee Rezin/Sun-Times

Andrew McMahon in the Wilderness performs on day two of Lollapalooza in Grant Park, Friday, Aug. 4, 2017. | Ashlee Rezin/Sun-Times

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

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

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

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

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

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

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

 Rob Zombie performs on day three of Riot Fest in Douglas Park, Saturday, Sept. 18, 2016. | Ashlee Rezin/Sun-Times

Rob Zombie performs on day three of Riot Fest in Douglas Park, Saturday, Sept. 18, 2016. | Ashlee Rezin/Sun-Times

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

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

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

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

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

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

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

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

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

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

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

 Thousands stream into Addams/Medill Park for day one of the Spring Awakening Music Festival, Friday, June 10, 2016. | Ashlee Rezin/Sun-Times  

Thousands stream into Addams/Medill Park for day one of the Spring Awakening Music Festival, Friday, June 10, 2016. | Ashlee Rezin/Sun-Times  

 Sufjan Stevens performs on day two of the Pitchfork Music Festival in Union Park, Saturday, July 16, 2016. | Ashlee Rezin/Sun-Times

Sufjan Stevens performs on day two of the Pitchfork Music Festival in Union Park, Saturday, July 16, 2016. | Ashlee Rezin/Sun-Times