Raw video from previous performances from some of the musicians who will perform at this year's Lollapalooza.

Mumford and Sons perform live at 2012 Grammy Awards

Source: CBS



Nine Inch Nails performance (file footage)



Phoenix performs live (file footage)



The Lumineers perform live at 2012 Grammy Awards

Source: CBS



Mutts perform live on WGN midday news (file footage)

Source: WGN TV