So much for "Sweet Emotion" at the H.O.G. party.

Citing what organizers referred to as "medical problems," Aerosmith has canceled its date at the Harley Owners Group's 25th anniversary celebration Aug. 28 at Miller Park.

The H.O.G. event will run concurrently with Harley-Davidson's 105th anniversary, slated for Aug. 29-30, but the events are separate.

Kid Rock, Sugarland and Joan Jett headline the Miller Park concert, which will be free for all H.O.G. members.

Other entertainment acts slated to appear at the H.O.G. event include DB Bryant, The Billy Bob Thornton Band, Jason Michael Carroll, and Big Bob and the Ballroom Blitz, plus comedians Greg Giraldo, John Bowman and Lewis Black.