With the advent of sound in the late 1920s, musicals gained popularity with the public and are exemplified by the films of Busby Berkeley, a choreographer known for his distinctive and elaborate set pieces featuring multiple showgirls. These lavish production numbers are typified by his choreographic work in "42nd Street", "Gold Diggers of 1933", "Footlight Parade" (all from 1933). During the 1930s, the musical films of Fred Astaire and Ginger Rogers became massive cultural fixtures in the eyes of the American public. These films included, "Top Hat" (1935), "Follow the Fleet", "Swing Time" (both 1936), and "Shall We Dance" (1937). Victor Fleming's "The Wizard of Oz" (1939) would become a landmark film for movie musical as it experimented with new technology such as Technicolor.