Helene Costello (1905-1957) was an American singer and actress active primarily during the 1920s and 1930s. She is best known for her contributions to the genre of popular music, particularly in the realm of jazz and traditional pop. Costello gained fame as a vocalist with well-known bands, including those led by Paul Whiteman and the Dorsey Brothers, showcasing her ability to blend emotional depth with musical elegance. Her notable works include recordings of songs like "My Heart Stood Still" and "I'm Gonna Sit Right Down and Write Myself a Letter," which exemplify her smooth vocal style and interpretative skills. She also appeared in several musical films, which helped to elevate her profile and bring her music to a broader audience. Costello's impact on music lies in her ability to bridge the gap between the vaudeville tradition and the emerging styles of jazz and swing, influencing a generation of singers who followed. Despite her relatively short career, her artistry contributed to the development of vocal performance in popular music, and she remains a respected figure in the history of American music.