Romberg's adaptation of melodies by Franz Schubert for Lilac Time (1921) and started him on the path to greatness. He subsequently wrote his best-known operettas, The Student Prince (1924), The Desert Song (1926) and The New Moon (1928), which were in a style similar to the Viennese operettas of Franz Lehar. He also wrote Rosalie (1928) together with George Gershwin. His later works, such as Up in…