During the Christmas season, the United States Air Force Band conducts a flash mob performance. This year they performed at the Union Station in Washington, DC, playing pop songs and commemorating veterans of World War II:
https://www.youtube.com/watch?v=khQN5ylb3H0
Last year, they performed at the National Air and Space Museum with traditional music:
http://www.littlethings.com/airmen-holiday-flashmob/?utm_source=huffingtonpost.com&utm_medium=referral &utm_campaign=pubexchange
Whether you celebrate Christmas or not, I think you will enjoy this music and the way that the USAF Band performs it.
Best wishes to all,
Don