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The duo had been slated to open one show apiece for Kenny Chesney and Keith Urban over the weekend. “I went into the studio between being out on the road, and I sang too much,” Jennifer explained in a July 20 video message to fans. “I blew my voice. It’s like a muscle, it’s like another part of your body that if you sprain it or strain it you have to heal it or else you will break it. And I don’t want to break it, because I want us to come back out there and see you.” Lady Antebellum filled in for Sugarland at Kenny’s San Francisco show, where fans were alerted about the cancellation as they arrived at the venue and offered refunds.