Lollapalooza fans walk through the mud in Grant Park on Aug. 5, the day after strong rains forced the evacuation of the music festival. | Scott Stewart~Sun-Times

Jack White performs at Lollapalooza Sunday August 5, 2012 in Grant Park. | Tom Cruze~Sun-Times

Fans get some water before Florence & the Machine performs at Lollapalooza Sunday August 5, 2012 in Grant Park. | Tom Cruze~Sun-Times

Jack White fans cheer during his show at Lollapalooza Sunday August 5, 2012 in Grant Park. | Tom Cruze~Sun-Times

Jack White fans cheer during his show at Lollapalooza Sunday August 5, 2012 in Grant Park. | Tom Cruze~Sun-Times

Sigur Ros performs at Lollapalooza Sunday August 5, 2012 in Grant Park. | Tom Cruze~Sun-Times

Jack White performs at Lollapalooza Sunday August 5, 2012 in Grant Park. | Tom Cruze~Sun-Times

Jack White performs at Lollapalooza Sunday August 5, 2012 in Grant Park. | Tom Cruze~Sun-Times

Florence & the Machine performs at Lollapalooza Sunday August 5, 2012 in Grant Park. | Tom Cruze~Sun-Times

Florence & the Machine performs at Lollapalooza Sunday August 5, 2012 in Grant Park. | Tom Cruze~Sun-Times

Florence & the Machine performs at Lollapalooza Sunday August 5, 2012 in Grant Park. | Tom Cruze~Sun-Times

Florence & the Machine performs at Lollapalooza Sunday August 5, 2012 in Grant Park. | Tom Cruze~Sun-Times

Chicago Mayor Rahm Emanuel was on hand to watch Florence & the Machine performing at Lollapalooza Sunday August 5, 2012 in Grant Park. | Tom Cruze~Sun-Times

Fans cool off with some water before Florence & the Machine performs at Lollapalooza Sunday August 5, 2012 in Grant Park. | Tom Cruze~Sun-Times

Jack White performs at Lollapalooza Sunday August 5, 2012 in Grant Park. | Tom Cruze~Sun-Times

Dan Auerbach

Lollapalooza, Frank Ocean, in concert on the Google Play Stage Saturday evening. August 4, 2012. I Scott Stewart~Sun-Times

The Weeknd performs on the Red Bull stage Saturday afternoon. August 4, 2012. I Scott Stewart~Sun-Times

Lollapalooza Day Three, damaged grounds from yesterday's storms that forced the evacuation from the overflowed music fest. With the skyline in the background near the Red Bull Soundstage mud and water cover most of the Southend of the field. Sunday, August 5, 2012. | Scott Stewart~Sun-Times

Lollapalooza Day Three, damaged grounds from yesterday's storms that forced the evacuation from the overflowed music fest. music fans walk into the muddy field near the Red Bull Soundstage. Sunday, August 5, 2012. | Scott Stewart~Sun-Times

Lollapalooza Day Three, damaged grounds from yesterday's storms that forced the evacuation from the overflowed music fest. music fans walk into the muddy field near the Red Bull Soundstage. Sunday, August 5, 2012. | Scott Stewart~Sun-Times

Lollapalooza Day Three, damaged grounds from yesterday's storms that forced the evacuation from the overflowed music fest. music fans walk into the muddy field near the Red Bull Soundstage. Sunday, August 5, 2012. | Scott Stewart~Sun-Times

Lollapalooza Day Three, damaged grounds from yesterday's storms that forced the evacuation from the overflowed music fest. A woman is carried over the muddy field near the Red Bull Soundstage. Sunday, August 5, 2012. | Scott Stewart~Sun-Times

Lollapalooza Day Three, damaged grounds from yesterday's storms that forced the evacuation from the overflowed music fest. Sunday, August 5, 2012. | Scott Stewart~Sun-Times

Lollapalooza Day Three, damaged grounds from yesterday's storms that forced the evacuation from the overflowed music fest. The steps leading down to the field even were covered in mud. Sunday, August 5, 2012. | Scott Stewart~Sun-Times

Jack White performs at Lollapalooza Sunday August 5, 2012 in Grant Park. | Tom Cruze~Sun-Times

Lollapalooza Day Three, damaged grounds from yesterday's storms that forced the evacuation from the overflowed music fest. Alone music fans walks over the muddy field near the Red Bull Soundstage. Sunday, August 5, 2012. | Scott Stewart~Sun-Times

Lollapalooza Day Three, damaged grounds from yesterday's storms that forced the evacuation from the overflowed music fest. Two music fans walk across Columbus Drive just after the main gates opened. Sunday, August 5, 2012. | Scott Stewart~Sun-Times

Lollapalooza Day Three, damaged grounds from yesterday's storms that forced the evacuation from the overflowed music fest. music fans walk across Columbus Drive after the main gates opened. Sunday, August 5, 2012. | Scott Stewart~Sun-Times

Lollapalooza Day Three, damaged grounds from yesterday's storms that forced the evacuation from the overflowed music fest. music fans find a dry spot near the Red Bull soundstage. Sunday, August 5, 2012. | Scott Stewart~Sun-Times

Lollapalooza Day Three, damaged grounds from yesterday's storms that forced the evacuation from the overflowed music fest. Two music gather near the Red Bull Soundstage on the third day of the music fest. Sunday, August 5, 2012. | Scott Stewart~Sun-Times

Lollapalooza Day Three, damaged grounds from yesterday's storms that forced the evacuation from the overflowed music fest. Sunday, The southend of Grant Park between the Sony and Red Bull soundstage as music fans move over to the next concert venue. August 5, 2012. | Scott Stewart~Sun-Times

Lollapalooza Day Three, damaged grounds from yesterday's storms that forced the evacuation from the overflowed music fest. Sunday, The southend of Grant Park between the Sony and Red Bull soundstage as music fans move over to the next concert venue. August 5, 2012. | Scott Stewart~Sun-Times

Lollapalooza Day Three, damaged grounds from yesterday's storms that forced the evacuation from the overflowed music fest. Sunday, The Sony stage with Polica in concert. August 5, 2012. | Scott Stewart~Sun-Times

Lollapalooza Day Three, damaged grounds from yesterday's storms that forced the evacuation from the overflowed music fest. concert lovers walk back through the muddy field near Perry's stage. Sunday, August 5, 2012. | Scott Stewart~Sun-Times

Lollapalooza Day Three, damaged grounds from yesterday's storms that forced the evacuation from the overflowed music fest. A clown trys to walk over the muddy field near Perry's stage. Sunday, August 5, 2012. | Scott Stewart~Sun-Times

Black Sabbath with Ozzy Osbourne rocks the Lollapalooza crowd Friday night. August 3, 2012. I Scott Stewart~Sun-Times

Black Sabbath with Ozzy Osbourne rocks the Lollapalooza crowd Friday night. August 3, 2012. I Scott Stewart~Sun-Times

Black Sabbath with Ozzy Osbourne rocks the Lollapalooza crowd Friday night. August 3, 2012. I Scott Stewart~Sun-Times

Black Sabbath with Ozzy Osbourne rocks the Lollapalooza crowd Friday night. August 3, 2012. I Scott Stewart~Sun-Times

Black Sabbath with Ozzy Osbourne rocks the Lollapalooza crowd Friday night. August 3, 2012. I Scott Stewart~Sun-Times

Black Sabbath with Ozzy Osbourne rocks the Lollapalooza crowd Friday night. August 3, 2012. I Scott Stewart~Sun-Times

Lollapalooza Day Three, damaged grounds from yesterday's storms that forced the evacuation from the overflowed music fest. Looking North from Perry's stage had a large section of damage Sunday, August 5, 2012. | Scott Stewart~Sun-Times

Tony Iommi

Dan Auerbach of the Black Keys performs on Friday night in Grant Park for Lollapalooza 2012. photo credit--Aundre Larrow