David Cook, left, winner of season seven of “American Idol,” performs a free concert for Airmen and their families outside the Dakota’s Club at Ellsworth Air Force Base, S.D., June 3, 2016. Prior to winning “American Idol,” Cook was working as a bartender and fronting his own band. (U.S. Air Force photo by Airman 1st Class Denise M. Nevins/Released)