The Wreckers have canceled three concerts this week because of illness. Jessica Harp began experiencing throat problems while touring with duo partner Michelle Branch. Among the cancellations was a Wednesday night (April 4) performance as Little Big Town's opening act at Arkansas State University in Jonesboro. Also canceled were a Friday (April 6) date at Riverwind Casino in Norman, Okla., and a Saturday appearance at WinStar Casino in Thackerville, Okla. The show in Norman has been rescheduled for Sept. 28.