CHICAGO, Ill. – One of the world's most iconic four-day festivals is underway in Chicago, but nasty wet weather could dampen plans to enjoy the music.The Lollapalooza festival runs from Thursday to Sunday, with music groups starting at 12 p.m.

CHICAGO, Ill. – One of the world's most iconic four-day festivals is underway in Chicago, but nasty wet weather could dampen plans to enjoy the music.The Lollapalooza festival runs from Thursday to Sunday, with music groups starting at 12 p.m.