Toby Keith's Oklahoma Twister Relief Concert takes place on Saturday (June 6), and the singer admits that while he's spearheading the event, even he doesn't really know how it's going to be structured yet. But in a recent interview he says it's likely there will be some celebrity duets between some of the stars involved.

The concert is scheduled for Saturday at the University of Oklahoma’s Gaylord Family – Oklahoma Memorial Stadium in Norman, Okla. Keith will be joined by an all-star lineup that includes Garth Brooks, Trisha Yearwood, Ronnie Dunn and Willie Nelson, as well as Mel Tillis and John Anderson. Rocker Sammy Hagar is also scheduled to perform, and Carrie Underwood will appear via satellite from Nashville. Krystal Keith and Kellie Coffey have also been added to the bill.

"The beautiful part of my deal is that I'm hosting," Keith tells CMT. "So I've gotta get everybody on and herd all the cats. If everybody wants to do 45 minutes, then I have no idea what time I'll go on. If we're ahead of schedule, I can do a full show. But if it's 10 before I get on, I'll shorten it up."

The singer says he'll probably duet with Willie Nelson on their hit 'Beer For My Horses,' and he'd be open to other collaborations, too. "I don't know Garth that well, but if he wants to do a duet, I'd love to jump up there," he notes.

The proceeds from the sold-out benefit concert will go to the United Way to assist those hit the hardest by the tornado that swept through Moore, Okla. on May 20. Keith says his hometown is resilient.

"They bounce back so quick there, it's amazing," he states. "You won't see them on TV six months from now crying for money and saying the government's not helping. Because they help each other out. They'll get it cleaned up pretty fast."

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