The Hungarian composer Lehar (1870-1948) was famous for his operettas when he settled in Vienna. In 1905, Lehar composed the operetta "The Merry Widow", which was performed in Vienna After the performance, he became famous in one fell swoop.

The plot is based on Meillac's comedy "The Attaché", which tells the story of Baron Jedda, the ambassador of the Principality of Pontevedro, in order to prevent the death of Hannah Gravalli, the wealthy widow of his country. She lost her property abroad and wanted Danilo, a retired guard cavalryman, to pursue her. In fact, Gravari and Danny Robben are a couple. After a period of bitter and bitter accusations against each other, the two finally formed a good relationship. There are 16 songs in the whole play, among which Gravalli's aria "Velia" in the second act is the most loved by the crowd. He composed nearly 40 operettas throughout his life. His important operetta works include "Women of Vienna" (1902), "The Count of Luxembourg" (1909), "Gypsy Love" (1910), "The Blue Mazurka" (1920), and "The Russian Crown Prince" (1927) and "Frederick" (1928).

In addition, "The Emperor" by British composer Sullivan (1842-1900), "The Wizard of the Nile" by American composer Herbert (1859-1924), and "The Wizard of the Nile" by De Kewen (1859-1920) "Robin Hood" and so on have made great contributions to the development of operetta.

In the 20th century, operetta was also called "musical comedy" (later referred to as "musical"). It is often performed in a more grandiose manner, but still retains its main style. In recent years, the art of musical theater has been highly refined and developed in the United States, as shown in Rodgers and Hart's "Old Friend Joey," Lerner and Lowe's "Boys and Dolls," and Cole Porter's "Kiss Me, Kate." " and Bernstein's "West Side Story" and other works, have been significantly reflected.