ATHENS, Alabama (AP) — Country singer Keith Urban had given just hours’ notice before he performed a free concert in the parking lot of a large supermarket and gas station in northern Alabama on Friday night.

Hundreds of people turned out for the show in Athens, about 100 miles south of Nashville, held in front of a Buc-ee’s, a chain of roadside shops known for their barbecue.

“I came to this Buc-ee’s about a month ago. And as I was leaving, I was like, ‘It would be fun to do a show there,'” Urban told the crowd during the concert, according to an Instagram video posted by WAFF-TV in Huntsville, Alabama.

Urban said his “caveman brain” told him it would be fun to set up a small stage for a small audience.

“I swear to you, I thought there were maybe 100, 200 people,” Urban said as a video showed a larger crowd.

News agencies reported that people began gathering hours before the show.

“I was at work and we heard on the radio that there was going to be a surprise concert at Buc-ee’s in Athens,” Cindy Wilson told FOX 54 WZDX-TV in Huntsville. “And I was like, ‘Oh my God, that’s on my way home.’ And it’s 15 minutes from my house. I just couldn’t believe it.”

While at the store, Urban also worked behind the food counter. One video showed him wearing a Buc-ee’s T-shirt and apron while pouring barbecue sauce over a brisket and cutting the meat into smaller pieces.