Greta Keller (1903-1967) was an Austrian singer and actress, renowned for her contributions to the genres of cabaret and popular music in the early to mid-20th century. Born in Vienna, she gained recognition during the 1920s for her captivating performances in German and English, blending elements of jazz and traditional European cabaret styles. Keller's notable works include her renditions of songs such as "Lili Marleen," which became iconic during World War II, and many original compositions that showcased her emotive vocal style. She was known for her ability to convey deep emotion and nuance, making her a favorite in the cabaret scene. Throughout her career, Keller performed in various countries, including Germany, France, and the United States, where she contributed to the cultural exchange of music styles. Her influence extended to later artists and the cabaret revival of the 1970s and 1980s. Although not as widely recognized today, Greta Keller's work remains significant for its sophistication and artistry, bridging traditional and modern musical expressions during a transformative period in European music history.