The Country Thunder USA music festival scheduled for May 29-June 1 near Dallas has been cancelled, but concert organizers say the decision will not affect the Country Thunder event taking place July 16-19 in Twin Lakes, Wis. Tim McGraw was scheduled to appear May 31 during the festival at Thunder Ridge Range, an area located between Waxahachie and Ennis, Texas. Others who had been booked to perform include Carrie Underwood, Dierks Bentley, Pat Green, Kellie Pickler and Joe Nichols. Country Thunder general manager Glenn Starnes said the cancellation was caused by a depressed economy, low ticket sales and the financial outcome of last year's festival in Texas. At least one day of the 2007 festival was canceled because of torrential rains that hit the Dallas area. Country Thunder presented a festival in April in Florence, Ariz. The festival scheduled for July 16-19 in Wisconsin will feature Sugarland, Underwood, Bentley, Taylor Swift, Miranda Lambert, Sara Evans and others.