The Andrews Sisters were an American close-harmony singing group popular from the late 1930s to the 1950s. Comprised of LaVerne, Maxene, and Patty Andrews, they became famous for their upbeat wartime hits like "Boogie Woogie Bugle Boy" and "Don't Sit Under the Apple Tree." Their tight harmonies, swing style, and energetic performances made them icons of the WWII era. They recorded over 600 songs and sold millions of records, influencing future vocal groups.