Sugarland called off their scheduled concert Saturday night at the Indiana State Fair after the stage collapsed just minutes before they were scheduled to go on.  As of Sunday night, at least five people have been confirmed dead and 45 injured as a result of the accident.  Sugarland, meanwhile, was forced to cancel their scheduled appearance at the Iowa State Fair Sunday because investigators wouldn't allow the band or its crew into the fairgrounds in Indiana because of an ongoing investigation into the collapse.  The Iowa concert will not be rescheduled and fans will be refunded for tickets purchased.