Girl Groups

A girl group is a music act featuring several female singers who
generally harmonize together. The term "girl group" is
also used in a narrower sense in the United States to denote the
wave of American female pop music singing groups, many of whom
were influenced by doo-wop and which flourished in the late 1950s
and early 1960s between the decline of early rock and roll and
start of the British Invasion.