In 1937, as America continued to pull itself out of the Great Depression only to face the ominous clouds of war looming over Europe and East Asia, a young and vivacious trio of sisters from Minneapolis burst upon the music scene with tight harmonies framing perfectly syncopated rhythms. They would revolutionize and forever change popular music.

With their first hit, "Bei Mir Bist Du Schon, " the sisters essentially vocalized the big band sound of the era. They went on to introduce a vocal form of boogie-woogie, originally a piano style, and were responsible for bringing various forms of ethnic music into the mainstream of American popular culture.

The trio's popularity soared throughout the 1940s, with hundreds of recordings, live shows, radio performances, and appearances in seventeen Hollywood musicals. But they are perhaps best remembered for their tireless devotion to entertaining troops overseas during World War II.