They've been flooded with online complaints and even issued an apology for their notoriously poor performance in December at the Allstate Arena, but now the members of the rock band Creed are facing a class-action lawsuit over the gig.

Filed by four fans Monday in Cook County Circuit Court, the lawsuit alleges that lead singer Scott Stapp was so "intoxicated and/or medicated" that he was unable to sing the lyrics to the band's songs.

The lawsuit alleges that Stapp's inability to sing was tantamount to canceling the show.

The tickets cost $50 each but the lawsuit estimates that with service charges, parking and other fees, the estimated 15,000 fans are owed $2 million. In an apology issued in January, the Florida-based band told fans that they had witnessed "the most unique of all Creed shows."

The band and its management could not be reached for comment late Monday.

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