5 ~ The Spice Girls

English pop girl group, The Spice Girls composed of members Mel B, Emma Bunton, Melanie C, Geri Halliwell, and Victoria Beckham is the best-selling female group of all time. The Spice Girls have also been credited with paving the way for the girl groups and female pop singers that have come after them.

Their phrase "girl power" was a message of empowerment that appealed to young girls, and adult women, and it emphasized the importance of strong and loyal friendship among females. It was a label for the particular facet of post classical neo-feminist empowerment embraced by the band.

Source: Wikipedia