DES MOINES, Iowa (AP) – The Iowa State Fair has been left with a big hole in its grandstand entertainment schedule because pop singer Meghan Trainor says she can’t complete her tour due to a vocal cord problem that requires surgery. Trainor, a popular 21-year-old who scored a No. 1 hit last year with “All About That Bass,” says she’s devastated. Fair spokeswoman Mindy Williamson says the fair must find a replacement to fill a key Saturday night grandstand slot on Aug. 22. Trainor’s show had sold 8,500 tickets.

Rockers Def Leppard and country artist Carrie Underwood have sold-out shows. Williamson says shows selling at least 10,000 tickets are considered sold out. Country singer Reba McEntire’s show on Aug. 16 has sold nearly 9,800 tickets so far.