 In addition to operating its film company and its property and investments company, J. C. Williamson continued to produce seasons of the Gilbert and Sullivan operas, seasons of operetta, musical comedy, straight plays, pantomimes and occasional musical revues, and later grand opera, ballet seasons, and concert tours by visiting celebrity singers and musicians, at the many theatres that it owned or leased throughout Australia and New Zealand until 1976, when the company closed and leased out its name.The company's activities even extended to London's West End, where it produced, among others, seasons of the musicals "High Jinks" (in 1916), and "Mr. Cinders" (1928).The J. C. Williamson Gilbert and Sullivan Opera Company was a successor to J. C. Williamson's Royal Comic Opera Companies.