Maria Banks plays Senior Master Sgt. Eric A. Sabatino’s harp at the Smithsonian's National Air and Space Museum in Washington, D.C., Dec. 3, 2013. Sabatino, a Concert Band and Orchestra Symphony solo harpist, allows Banks, a harpist and planetary geologist for the Earth and Planetary Studies at the Smithsonian Institution National Air and Space Museum, to play a song on his harp after the band’s flash mob performance. The band interacted with museum spectators after surprising them with a few holiday songs to spread word of their upcoming shows. (U.S. Air Force photo by/ Airman 1st Class Nesha Humes)