Chief Master Sgt. Deborah Volker, Strolling Strings’ violinist, shows her violin after a performance, to museumgoers at the National Museum of American History in Washington, D.C., July 16, 2015. The U.S. Air Force Band’s Strolling Strings show was part of the museum’s Star-Spangled American Music Series. (U.S. Air Force photo/Airman 1st Class Ryan J. Sonnier)