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Even without an official lineup, music fans are still eager to get their hands on a ticket to this year's Lollapalooza festival

The Chicago Tribune says standard three-day passes to the event quickly sold out after hitting the market Tuesday morning.  VIP and Platinum three-day passes are still available at, and single-day tickets are scheduled to go on sale Wednesday at 10 a.m. Central. 

The 2014 roster is also set to be unveiled on Wednesday, possibly confirming rumors that Eminem, Kings of Leon, Arctic Monkeys, and Skrillex will be among the headliners.  Lollapalooza gets under way at Chicago's Grant Park on August 1st.