 It had successful foreign productions and tours.During the gloomy days of World War I, audiences, including servicemen on leave, wanted light and uplifting entertainment, and they flocked to theatres to see lighthearted musical comedies, a number of which broke box-office records.These included "The Bing Boys Are Here" (1916), "Chu Chin Chow" (1916), and "The Maid of the Mountains" (1917).