The Hartford Circus Fire was one of the worst fire disasters in US history. While thousands of spectators in Hartford, Connecticut, were enjoying an afternoon performance of the Ringling Bros. and Barnum & Bailey Circus, a fire broke out in the tent. The big top, waterproofed with a coating of paraffin and gasoline, quickly collapsed in flames, trapping hundreds beneath it. About 169 people died. What song is traditionally used by circuses to discretely alert staff when an emergency arises? Discuss