It is as true today as it was in the early days of rock 'n' roll - a girl group in full sway is an irresistible and uplifting force of nature, while life within the group is a heady and combustible mix of talent, ambition and hairspray. Members of legendary girl groups Bananarama, the Bangles, Sister Sledge, the Ronettes, the Supremes, the Spice Girls and Girls Aloud discuss what it is really like inside these mysterious sisterhoods.