Scenes from Lollapalooza 2012
Lollapalooza is one of Chicago's biggest music fests, taking over downtown for three days to feature such headliners as Red Hot Chili Pepper, Black Sabbath, Frank Ocean and J. Cole. 270,000 people are expected to fill Grant Park this weekend.
Lollapalooza is a party that's been taking place since 1991, and has made Chicago its home since 2005.