The Andrews Sisters

The Andrews Sisters were an American close harmony singing group of the swing and boogie-woogie eras. The group consisted of three sisters: contralto LaVerne Sophia (July 6, 1911 – May 8, 1967), soprano Maxine Angelyn "Maxene" (January 3, 1916 – October 21, 1995), and mezzo-soprano Patricia Marie "Patty" (February 16, 1918 – January 30, 2013). Throughout their long career, the sisters sold well over 75 million records (the last official count released by MCA Records in the mid-1970s). Their 1941 hit "Boogie Woogie Bugle Boy" can be considered an early example of rhythm and blues or jump blues.

source: Wikipedia