"God bless you, Oklahoma!" Yearwood yelled, according to the World.
Some concertgoers said their experiences with tornadoes or someone affected by the recent storms drew them to the fund-raising event.
Marie Carter, a physician whose office is in Oklahoma City, said she watched helplessly as a twister moved through Moore, coming within a half-mile of her own home.
"It was very scary for a lot of us," Carter said, according to the World. "We've been out there helping our friends, digging through the rubble, and because we're so close, we've had a lot of patients come in who lost everything who have symptoms of PTSD. It's almost surreal, but we wanted to come out and support this cause."
Information from: Tulsa World, http://www.tulsaworld.com