I heard an interesting piece on the radio about these ladies. They are fabulous!
The International Sweethearts of Rhythm was the first integrated all women's band in the United States. During the 1940s the band featured some of the best female musicians of the day. They played swing and jazz on a national circuit that included the Apollo Theater in New York City, the Regal Theater in Chicago, and the Howard Theater in Washington, DC. After a performance in Chicago in 1943, the Chicago Defender announced the band was, "One of the hottest stage shows that ever raised the roof of the theater!" More recently, they have been labeled "the most prominent and probably best female aggregation of the Big Band era.