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Listen to Alison preview Lollapalooza 2007 with music critic Andy Langer

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Credit: Mark Segal/Getty Images

Insert Pearl Jam here: Lollapalooza kicks off today in Chicago's Grant Park, on Lake Michigan.

The first place Cubs take a back seat in Chicago this weekend, as Lollapalooza comes to town. The festivities kicked off just a few hours ago, and Alison spoke to Esquire music critic and radio host Andy Langer, who called us from the concert site to break down the weekend's lineup and tell us which bands are likely to make a big splash. The festival will be the site of Pearl Jam's only major concert this year.