15 Facts About History’s Most Popular Girl Groups

(via Mental Floss) Like “boy bands,” “girl groups” is one of those musical genres that’s difficult to define, but has had an incredible influence on pop music through the years. When rounding up the best 100 songs by girl groups in 2017, Billboard outlined the criteria they used to determine which groups could be considered: “it had to be all-female, it had to have at least three members, and it had to be primarily vocal in nature.”In addition to the many hits girl groups have churned out over the years, the genre has a rich and storied history. Here are 15 fascinating facts about girl groups through the decades.