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TRAVERSE CITY, Mich. (AP) _ A surgical procedure has forced singer-songwriter Sheryl Crow to cancel her second concert in Michigan this summer.

The William Morris Agency, which represents Crow, said she would not make her scheduled Aug. 6 concert date at the Turtle Creek Casino in Williamsburg.

The agency said Monday that Crow had ``an unavoidable medical condition that required surgery.'' It wouldn't specify the medical problem but said the 39-year-old was resting at home and was expected to recover within two weeks.

The seven-time Grammy winner also canceled a planned July 7 concert at the National Cherry Festival, citing scheduling conflicts with her recording studio, the Traverse City Record-Eagle reported.

Refunds for the canceled concert will be available at the place of purchase.