Paul Lincke pioneered the Berlin operetta in 1899 with "Frau Luna", which includes ""Berliner Luft"" ("Berlin Air"), which became the unofficial anthem of Berlin. His "Lysistrata" (1902) includes the song and tune "The Glow-Worm", which remains quite popular internationally. Much later, in the 1920s and 1930s, Kurt Weill took a more extreme form of the Berlin operetta style and used it in his operas, operettas, and musicals. It is arguable that some of Kurt Weill's compositions could be considered as modernist operetta.