Kids, kids, kids... a long time ago, in a galaxy far far far. On a distant planet known as Earth and in an era known as the early 1960's -- girl group singers (generally a trio and sometimes a quartet) were popular in the music of that era. There were white girl groups and black girl groups. It was one crazy time for rock-n-roll but these girl groups managed to forever represent that era in more ways than one. This continues to this day.
Though there were countless of girl groups popping-up like weeds everywhere in those days, most were relegated to the 'one-hit-wonder' status. Several girl groups lingered and enjoyed enormous acclaim and managed to succeed in many realms of the entertainment industry, etc.
Here's a list of some of the most famous girl groups from the 1960's:
The Marvellettes
The Ronettes
The Angels
The Shangri-Las
The Shirelles
The Chiffons
Martha Reeves and The Vandellas
The Honeys
... and the most famous of them all: The Supremes/Diana Ross & The Supremes
DREAMGIRLS' The Dreamettes/The Dreams/Deena Jones & The Dreams were inspired loosely on this famous group: The Supremes/Diana Ross & The Supremes.
Also, the Urchins from LITTLE SHOP OF HORRORS are also inspired by these girl groups of the 1960's (hence their names), as were The Dynamites (from HAIRSPRAY) and even The Radio (from CAROLINE, OR CHANGE).
For obvious reasons, the Muses in Disney's HERCULES were also inspired by these girl groups of the 1960's.