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,... [more on Wikipedia]