Matt sends, "video I caught of a spontaneous jam session that happened in front of me at Mardi Gras 2015: A USMC band and a bunch of high school band members met in the streets and suddenly launched into 'St. James Infirmary.'"

http://feeds.boingboing.net/~r/boingboing/iBag/~3/GWJOWi8eP8c/9spontaneous-jam-usmc-hs-ma.html