The Boswell Sisters were an American close harmony singing trio of the jazz and swing eras, consisting of three sisters: Martha Boswell (June 9, 1905 – July 2, 1958), Connie Boswell (later spelled "Connee", December 3, 1907 – October 11, 1976), and Helvetia "Vet" Boswell (May 20, 1911 – November 12, 1988). Hailing from uptown New Orleans, the group blended intricate harmonies and song arrangements featuring effects such as scat, instrumental imitation, ‘Boswellese’ gibberish, tempo and meter changes, major/minor juxtaposition, key changes, and incorporation of sections from other songs. They attained national prominence in the United States in the 1930s during the twilight of the Jazz Age and the onset of the Great Depression.

After the trio split in 1936, Connie continued as a solo vocalist in radio, film, and later television for an additional quarter century. The trio's "unique singing style and ground-breaking arrangements fused 'blackness' and 'whiteness' in music," and their collaborations with "the preeminent white swing musicians of their day—the Dorsey Brothers, Glenn Miller, Benny Goodman, Joe Venuti and Eddie Lang, Artie Shaw, Victor Young, Bunny Berigan—had a profound effect on the development of the big band sound in the 1930s." When assessing their legacy, scholars claim the Boswell Sisters "made 'real' jazz commercially viable, destigmatizing the music and opening its appreciation to the wider American public."